devtools/gerrit: bump to 3.0.8, add OWNERS plugins

Change-Id: I161ca0339bec0486c9b1446b141ecf1424112d9c
diff --git a/bzl/workspace-status.sh b/bzl/workspace-status.sh
index 5450017..c039372 100755
--- a/bzl/workspace-status.sh
+++ b/bzl/workspace-status.sh
@@ -15,6 +15,7 @@
 }
 
 echo STABLE_BUILD_GERRIT-OAUTH-PROVIDER_LABEL $(rev .)
+echo STABLE_BUILD_OWNERS_LABEL $(rev .)
 echo STABLE_GIT_COMMIT $(git rev-parse HEAD)
 echo STABLE_GIT_VERSION $(rev .)
 echo STABLE_BUILDER $(id -un)@$(hostname -f):$(pwd)