Backup and restore setup.sh before upgrading contrail-setup package.
	Fix upgrade: In 1.10 setup.sh was packaged in contrail-setup and contrail-install-packages
	So when upgrading contrail-install-packages, it will fail, we will need to use rpm -iU --force to upgrade
        To avoid this and use yum localinstall, post section for using setup.sh.new is done.

Change-Id: I483a4b4364624a5e3d390e090661398f681450db