fix with cluster mode for ceph tests

Change-Id: Id201c6b105588dd32d5676c225f54560bd0645aa
remove dublication for internal_net

Change-Id: I1c0eb162df1e91d17cfa617983c45473affadeea
default gateway are redefined

Change-Id: Ib2ef5ef113efb710cd23dcd4dbe053cd1d3559c1
Make shallow clone of repos to build iso

Change-Id: Ib187292fb4d11bc2bd7c764815f8b8c25170d1de