Remove obsolete Bazel spawn strategies

After the latest Bazel upgrade, the --spawn_strategy=standalone
doesn't show the output of the subprocess created, making the
troubleshoot of the failures impossible.

The sandboxing was introduced many years ago with
Change-Id: I15bc00861 because of the initial limitations of sandboxing
with Docker. With the recent versions of Bazel this legacy flags
shouldn't be needed anymore.

Change-Id: I0a68895b57d3d6f066de3ac9420a00f2e02a09c8
diff --git a/jenkins/gerrit-bazel-build-account-plugin.sh b/jenkins/gerrit-bazel-build-account-plugin.sh
index ccc7795..afff686 100644
--- a/jenkins/gerrit-bazel-build-account-plugin.sh
+++ b/jenkins/gerrit-bazel-build-account-plugin.sh
@@ -37,7 +37,7 @@
 
 java -fullversion
 bazelisk version
-bazelisk build $BAZEL_OPTS --spawn_strategy=standalone --genrule_strategy=standalone $TARGETS
+bazelisk build $BAZEL_OPTS $TARGETS
 bazelisk test $BAZEL_OPTS --test_env DOCKER_HOST=$DOCKER_HOST //tools/bzl:always_pass_test plugins/account/...
 
 for JAR in $(find bazel-bin/plugins/account -name account*.jar)
diff --git a/jenkins/gerrit-bazel-build-examples-plugin.sh b/jenkins/gerrit-bazel-build-examples-plugin.sh
index c3d8f7b..f5621d9 100644
--- a/jenkins/gerrit-bazel-build-examples-plugin.sh
+++ b/jenkins/gerrit-bazel-build-examples-plugin.sh
@@ -6,4 +6,4 @@
 
 java -fullversion
 bazelisk version
-bazelisk build --spawn_strategy=standalone --genrule_strategy=standalone all
+bazelisk build all
diff --git a/jenkins/gerrit-bazel-build-its-plugin-branch.sh b/jenkins/gerrit-bazel-build-its-plugin-branch.sh
index 12698ef..eb87d98 100644
--- a/jenkins/gerrit-bazel-build-its-plugin-branch.sh
+++ b/jenkins/gerrit-bazel-build-its-plugin-branch.sh
@@ -28,7 +28,7 @@
 
 java -fullversion
 bazelisk version
-bazelisk build $BAZEL_OPTS --spawn_strategy=standalone --genrule_strategy=standalone $TARGETS
+bazelisk build $BAZEL_OPTS $TARGETS
 bazelisk test $BAZEL_OPTS --test_env DOCKER_HOST=$DOCKER_HOST //tools/bzl:always_pass_test plugins/its-{name}/...
 
 for JAR in $(find bazel-bin/plugins/its-{name} -name its-{name}*.jar)
diff --git a/jenkins/gerrit-bazel-build-its-plugin.sh b/jenkins/gerrit-bazel-build-its-plugin.sh
index 702f64e..ddf2e51 100644
--- a/jenkins/gerrit-bazel-build-its-plugin.sh
+++ b/jenkins/gerrit-bazel-build-its-plugin.sh
@@ -24,7 +24,7 @@
 
 java -fullversion
 bazelisk version
-bazelisk build $BAZEL_OPTS --spawn_strategy=standalone --genrule_strategy=standalone $TARGETS
+bazelisk build $BAZEL_OPTS $TARGETS
 bazelisk test $BAZEL_OPTS --test_env DOCKER_HOST=$DOCKER_HOST //tools/bzl:always_pass_test plugins/its-{name}/...
 
 for JAR in $(find bazel-bin/plugins/its-{name} -name its-{name}*.jar)
diff --git a/jenkins/gerrit-bazel-build-owners-plugin-branch.sh b/jenkins/gerrit-bazel-build-owners-plugin-branch.sh
index a31dc41..9f219ae 100644
--- a/jenkins/gerrit-bazel-build-owners-plugin-branch.sh
+++ b/jenkins/gerrit-bazel-build-owners-plugin-branch.sh
@@ -21,7 +21,7 @@
 
 java -fullversion
 bazelisk version
-bazelisk build --spawn_strategy=standalone --genrule_strategy=standalone $TARGETS
+bazelisk build $TARGETS
 
 for JAR in $(find bazel-bin/plugins/ -name {name}*.jar)
 do
diff --git a/jenkins/gerrit-bazel-build-owners-plugin.sh b/jenkins/gerrit-bazel-build-owners-plugin.sh
index ef1305b..ea12027 100644
--- a/jenkins/gerrit-bazel-build-owners-plugin.sh
+++ b/jenkins/gerrit-bazel-build-owners-plugin.sh
@@ -21,7 +21,7 @@
 
 java -fullversion
 bazelisk version
-bazelisk build --spawn_strategy=standalone --genrule_strategy=standalone $TARGETS
+bazelisk build $TARGETS
 
 for JAR in $(find bazel-bin/plugins/ -name {name}*.jar)
 do
diff --git a/jenkins/gerrit-bazel-build-plugin-branch.sh b/jenkins/gerrit-bazel-build-plugin-branch.sh
index 355d075..d6662c2 100644
--- a/jenkins/gerrit-bazel-build-plugin-branch.sh
+++ b/jenkins/gerrit-bazel-build-plugin-branch.sh
@@ -29,7 +29,7 @@
 TARGETS=$(echo "{targets}" | sed -e 's/{{name}}/{name}/g')
 java -fullversion
 bazelisk version
-bazelisk build $BAZEL_OPTS --spawn_strategy=standalone --genrule_strategy=standalone $TARGETS
+bazelisk build $BAZEL_OPTS $TARGETS
 
 BAZEL_OPTS="$BAZEL_OPTS --spawn_strategy=standalone --genrule_strategy=standalone \
                    --test_output errors \
diff --git a/jenkins/gerrit-bazel-build-plugin-manual.sh b/jenkins/gerrit-bazel-build-plugin-manual.sh
index 7f8479e..6afac36 100644
--- a/jenkins/gerrit-bazel-build-plugin-manual.sh
+++ b/jenkins/gerrit-bazel-build-plugin-manual.sh
@@ -20,7 +20,7 @@
 
 java -fullversion
 bazelisk version
-bazelisk build --spawn_strategy=standalone --genrule_strategy=standalone $TARGETS
+bazelisk build $TARGETS
 
 for JAR in $(find bazel-bin/plugins/{name} -name {name}*.jar)
 do
diff --git a/jenkins/gerrit-bazel-build-plugin.sh b/jenkins/gerrit-bazel-build-plugin.sh
index 6d168af..e2c778e 100644
--- a/jenkins/gerrit-bazel-build-plugin.sh
+++ b/jenkins/gerrit-bazel-build-plugin.sh
@@ -27,7 +27,7 @@
 
 java -fullversion
 bazelisk version
-bazelisk build $BAZEL_OPTS --spawn_strategy=standalone --genrule_strategy=standalone $TARGETS
+bazelisk build $BAZEL_OPTS $TARGETS
 bazelisk test $BAZEL_OPTS --test_env DOCKER_HOST=$DOCKER_HOST //tools/bzl:always_pass_test plugins/{name}/...
 
 for JAR in $(find bazel-bin/plugins/{name} -maxdepth 1 -name {name}*.jar)
diff --git a/jenkins/gerrit-bazel-build.sh b/jenkins/gerrit-bazel-build.sh
index 3a2ef97..b9c0eea 100644
--- a/jenkins/gerrit-bazel-build.sh
+++ b/jenkins/gerrit-bazel-build.sh
@@ -9,8 +9,6 @@
   export BAZEL_OPTS=""
 fi
 
-export BAZEL_OPTS="$BAZEL_OPTS --spawn_strategy=standalone --genrule_strategy=standalone"
-
 java -fullversion
 bazelisk version
 bazelisk build $BAZEL_OPTS plugins:core release api
diff --git a/jenkins/gerrit-bazel-test.sh b/jenkins/gerrit-bazel-test.sh
index 78bc9cd..4c289f9 100755
--- a/jenkins/gerrit-bazel-test.sh
+++ b/jenkins/gerrit-bazel-test.sh
@@ -9,7 +9,7 @@
   export BAZEL_OPTS=""
 fi
 
-export BAZEL_OPTS="$BAZEL_OPTS --spawn_strategy=standalone --genrule_strategy=standalone \
+export BAZEL_OPTS="$BAZEL_OPTS \
                    --test_output errors \
                    --test_summary detailed --flaky_test_attempts 3 \
                    --test_verbose_timeout_warnings --build_tests_only \
diff --git a/jenkins/gerrit-bazel-verifier-test.sh b/jenkins/gerrit-bazel-verifier-test.sh
index c4c4965..8851b4d 100755
--- a/jenkins/gerrit-bazel-verifier-test.sh
+++ b/jenkins/gerrit-bazel-verifier-test.sh
@@ -15,7 +15,7 @@
     TEST_TAG_FILTER="-flaky"
 esac
 
-export BAZEL_OPTS="$BAZEL_OPTS --spawn_strategy=standalone --genrule_strategy=standalone \
+export BAZEL_OPTS="$BAZEL_OPTS \
                  --test_output errors \
                  --test_summary detailed --flaky_test_attempts 3 \
                  --test_verbose_timeout_warnings --build_tests_only \