[SDFAB-933] Integrate atomix-3.1.12 and expose demote API

Additionally, this patch adds unit tests for demote and
updates a bunch of testing tools

Change-Id: I9636078b08486c9167ae253f0251f72239ad2802
diff --git a/WORKSPACE b/WORKSPACE
index 29dca06..e70e347 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -42,8 +42,8 @@
 
 # Use this to build against locally built Atomix
 #local_atomix(
-#    path = "/home/developer/atomix",
-#    version = "3.1.9-SNAPSHOT",
+#    path = "/home/sdn/atomix",
+#    version = "3.1.12-SNAPSHOT",
 #)
 
 # Use this to build against locally built YANG tools