Upgrade bazlets to latest stable-3.0

- Set snapshot version to 3.0.11-SNAPSHOT
- Add repository rule to provide gerrit api version

Change-Id: I57515a908e7c31b01165a829ed8f427a85ee12de

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index c0a1698..1251e7c 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "928c928345646ae958b946e9bbdb462f58dd1384",
+    commit = "7538805fe00406afadcf4ff6dea053fb78d6c132",
     #local_path = "/home/<user>/projects/bazlets",
 )