Update bazlets for java, javatests layout

Change-Id: I860551b8d4627c952c53f2bc69f74cbfa4806792

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 9463f1a..6b94c8c 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//tools:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "680d42de63b146e77d41685b38a295abb2980b6d",
+    commit = "a615d69786a965e9622761ff2229446115732cca",
     # local_path = "/home/<user>/projects/bazlets",
 )