Pull in patched common-packer

common-packer needed a patch to properly support EC2 as well as the
default OpenStack packer templates.

Change-Id: If1c0fee96eb1a8b5afdecc09ff3c1ea55db65fc6
Signed-off-by: Linux Foundation Administrators <collab-it+onlab@linuxfoundation.org>
diff --git a/packer/common-packer b/packer/common-packer
index 817cc14..edc12fd 160000
--- a/packer/common-packer
+++ b/packer/common-packer
@@ -1 +1 @@
-Subproject commit 817cc1463a60d05fe57bf7869cf9469efda7275c
+Subproject commit edc12fdbd0d43bd54bdd79dfd16d349506a16bb7