Temporarily remove testmdia from extended image
Temporarily remove testmdia from extended image

Need to clear some space out of the test image until we
have a long-term solution.

Change-Id: I7e0399496daf7656b8b7803ad750f0326fe6aa0f
Reviewed-on: http://gfw160.aus.stglabs.ibm.com:8080/gerrit/20620
Reviewed-by: Thi N. Tran <25a2bca7ae5a8ea03be09ca8d282480c08c13052@us.ibm.com>
Reviewed-by: Daniel M. Crowell <912029ca9254ac7b5854e56910561d682e1fa2d0@us.ibm.com>
Tested-by: Jenkins Server

Over-enthusiastic/hostboot,alvintpwang/hostboot,alvintpwang/hostboot,open-power/hostboot,Over-enthusiastic/hostboot,csmart/hostboot,open-power/hostboot,csmart/hostboot,open-power/hostboot,open-power/hostboot,alvintpwang/hostboot,csmart/hostboot,csmart/hostboot,Over-enthusiastic/hostboot,csmart/hostboot,alvintpwang/hostboot,alvintpwang/hostboot,Over-enthusiastic/hostboot,Over-enthusiastic/hostboot,open-power/hostboot