Add buildifier check to bazel verify build

Change-Id: I87ad60217718dd41e5c96b59199227e52a8ee6e6
diff --git a/jjb/onos/onos-bazel-verify.sh b/jjb/onos/onos-bazel-verify.sh
index 46b283c..e6aae1d 100644
--- a/jjb/onos/onos-bazel-verify.sh
+++ b/jjb/onos/onos-bazel-verify.sh
@@ -13,3 +13,4 @@
 
 bazel build onos
 bazel query "tests(//...)" | SHLVL=1 xargs bazel test
+bazel run //:buildifier_check