Merge branch 'stable-3.1' into stable-3.2

* stable-3.1:
  Adapt SNAPSHOT plugin api example to the 3.1 version
  Upgrade bazlets to latest stable-3.1
  Prepare for new gerrit_api snapshot version usage
  Upgrade bazlets to latest stable-3.0
  Upgrade bazlets to latest stable-3.0

Change-Id: If7b6f69d6d8230c12dedfd514f3dbed8ef919876

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 5692161..3671e11 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "bd8db0cf3057397bcf7287c28cc93886e663989b",
+    commit = "5c26af9e0374ede4cd67939be972adf6c4cda791",
     #local_path = "/home/<user>/projects/bazlets",
 )