Added a ceph-libs-compat package in accordance with Fedora packaging
guidelines [1], to handle the recent package split more gracefully.
In Fedora this is necessary because there are already other packages
depending on ceph-libs, that need to be adjusted to depend on the new
split packages instead. In the mean time, ceph-libs-compat prevents
breakage.

[1] http://fedoraproject.org/wiki/Upgrade_paths_%E2%80%94_renaming_or_splitting_packages
Add obsoletes for libcephfs, this fixes a bug for Fedora:
https://bugzilla.redhat.com/show_bug.cgi?id=1116614
Don't autostart ceph service on Fedora. This patch is taken from the
current Fedora package and makes the upstream ceph.spec compliant
with Fedora policy. The goal is to be fully compliant upstream so that
we can replace current Fedora package with upstream package to fix
many bugs in Fedora.
We need those nice recent changes for rhel7 in Fedora too.