Update charts to 2.15 for master branch

Change-Id: I8ba1c6a587d86cf4ea6c9dd8034026658c8b6e0a
Signed-off-by: Akash Reddy Kankanala <akash.kankanala@radisys.com>
diff --git a/VERSION b/VERSION
index 10e3964..240bba9 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.4.13
\ No newline at end of file
+3.7.0
\ No newline at end of file