Upgrade common-packer to v0.3.1

Change-Id: I4cb5f5ded765abfacd87d183908544f7d76b74a6
Signed-off-by: Vanessa Rene Valderrama <vvalderrama@linuxfoundation.org>

diff --git a/packer/common-packer b/packer/common-packer
index 837c821..6c6ee4d 160000 (submodule)
--- a/packer/common-packer
+++ b/packer/common-packer
@@ -1 +1 @@
-Subproject commit 837c821df6fa77bd81a73ecbee94bdd8e24b3172
+Subproject commit 6c6ee4d08580f2524b297a7b4477294079a0ad04