Packaging setup.sh only in contrail-install-packages

In earlier releases setup.sh is packaged in contrail-install-packages
and contrail-setup, so during upgrade of contrail-install-packages
the setup.sh is not replaced as the file is owned by contrail-setup package
aswell, so adding Replaces: contrail-setup in the contrail-install-packages
control file and packaging setup.sh only in contrail-install-packages.

Change-Id: I405b8888659bf3d8576b4f3e87f5f320f57b9fb4
Closes-Bug: 1394387