Removing all the neutron Obsoletes

The Obsoletes clause make it impossible to maintain multiple
versions of the RPMs in the repo, and still be able to install
the specified version. When we try to install an older version,
the installer sees that theres a newer version in the repo and that
obsoletes the older version making it impossible to install that

Change-Id: I389e0ed2608d5cd174a862c039c34efeb9419dee