Sync submodules before update
Sync submodules before update

When submodule URL is changed in .gitmodules,
update fails and this error can be easily overseen.

Change-Id: Iec55b35356db0b83cf86dea779e4379fff1f8d04

xbezdick/packstack,larsks/packstack,mahak/packstack,larsks/packstack,fr34k8/packstack,palmer159/openstack-test,palmer159/openstack-test,stackforge/packstack,stackforge/packstack,mahak/packstack,xbezdick/packstack,larsks/packstack,openstack/packstack,fr34k8/packstack,stackforge/packstack,imcsk8/packstack,fr34k8/packstack,imcsk8/packstack,openstack/packstack,imcsk8/packstack,mahak/packstack,openstack/packstack,palmer159/openstack-test,xbezdick/packstack