Update common-packer to latest v0.7.0

Change-Id: I6665eb5aaecd96e880d51dfeb809de7f5a1b245f
Signed-off-by: Anil Belur <abelur@linuxfoundation.org>

diff --git a/packer/common-packer b/packer/common-packer
index a34a25187d428d6f5c9c6a19bb2b63b6c2688320..e96974fa52edb7d8e7f27d314155bd088255e07d 160000 (submodule)
--- a/packer/common-packer
+++ b/packer/common-packer
@@ -1 +1 @@
-Subproject commit a34a25187d428d6f5c9c6a19bb2b63b6c2688320
+Subproject commit e96974fa52edb7d8e7f27d314155bd088255e07d