Format BUILD files with buildifier

Using buildifier from master branch and the command:
$ buildifier -r -lint fix -warnings all .

Change-Id: I52a18c09a1f192e2141f4156f9c1aabbbdbc910a
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

tools/BUILD

diff --git a/tools/BUILD b/tools/BUILD
index f6f29ba..6741d23 100644
--- a/tools/BUILD
+++ b/tools/BUILD
@@ -1,9 +1,9 @@
-load("@rules_java//java:defs.bzl", "java_package_configuration")
 load(
     "@bazel_tools//tools/jdk:default_java_toolchain.bzl",
     "JDK9_JVM_OPTS",
     "default_java_toolchain",
 )
+load("@rules_java//java:defs.bzl", "java_package_configuration")
 
 default_java_toolchain(
     name = "error_prone_warnings_toolchain",