Cross-build SBT plugins with Gerrit 2.13/2.14/2.15

Change-Id: Id35b0faef962cd259a90f317e36284193fab06de
diff --git a/jenkins/gerrit-sbt-build-plugin.sh b/jenkins/gerrit-sbt-build-plugin.sh
index d672add..f5f2564 100644
--- a/jenkins/gerrit-sbt-build-plugin.sh
+++ b/jenkins/gerrit-sbt-build-plugin.sh
@@ -2,7 +2,7 @@
 
 if [ -f "gerrit/BUILD" ]
 then
-  git read-tree -u --prefix=gerrit gerrit/{branch}
+  git read-tree -u --prefix=gerrit gerrit/{gerrit-branch}
   . set-java.sh 8
 
   pushd gerrit
diff --git a/jenkins/gerrit-sbt-plugin-analytics.yaml b/jenkins/gerrit-sbt-plugin-analytics.yaml
index da123bb..3f85b02 100644
--- a/jenkins/gerrit-sbt-plugin-analytics.yaml
+++ b/jenkins/gerrit-sbt-plugin-analytics.yaml
@@ -1,7 +1,11 @@
 - project:
     name: analytics
-    branch:
-      - master
-      - stable-2.14
     jobs:
-      - 'plugin-{name}-sbt-{branch}'
+      - 'plugin-{name}-sbt-{branch}-{gerrit-branch}':
+          branch:
+            - master
+          gerrit-branch:
+            - master
+            - stable-2.15
+            - stable-2.14
+            - stable-2.13
diff --git a/jenkins/gerrit-sbt-plugin-gerrit-support.yaml b/jenkins/gerrit-sbt-plugin-gerrit-support.yaml
index 1acc12d..1543d06 100644
--- a/jenkins/gerrit-sbt-plugin-gerrit-support.yaml
+++ b/jenkins/gerrit-sbt-plugin-gerrit-support.yaml
@@ -1,6 +1,11 @@
 - project:
     name: gerrit-support
-    branch:
-      - master
     jobs:
-      - 'plugin-{name}-sbt-{branch}':
+      - 'plugin-{name}-sbt-{branch}-{gerrit-branch}':
+          branch:
+            - master
+          gerrit-branch:
+            - master
+            - stable-2.15
+            - stable-2.14
+            - stable-2.13
diff --git a/jenkins/gerrit-sbt-plugin-template.yaml b/jenkins/gerrit-sbt-plugin-template.yaml
index 2643ebd..08c05d9 100644
--- a/jenkins/gerrit-sbt-plugin-template.yaml
+++ b/jenkins/gerrit-sbt-plugin-template.yaml
@@ -1,6 +1,6 @@
 - job-template:
-    name: 'plugin-{name}-sbt-{branch}'
-    description: "Plugin {name} {branch} branch build with Sbt\n"
+    name: 'plugin-{name}-sbt-{branch}-{gerrit-branch}'
+    description: "Plugin {name} {branch} branch build with Sbt on top of Gerrit {gerrit-branch}\n"
     node: sbt
     wrappers:
       - timeout: