Upgrade bazlets to latest stable-2.14

Fix genrule2 to clean up temporary folder content

Change-Id: I1d186a2082b364f7acc2d99c20ec0211efebbfd2

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index b8021e7..bef837b 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "bec81c8319e560d2a92ba0fe35d40d021ffd7708",
+    commit = "ece89b00ac1049233d9f5bb471a8d37b57667d9e",
     #local_path = "/home/<user>/projects/bazlets",
 )