build-ceph-rpm.sh:  Fixes for RPM builds

Several fixes for the RPM build script including writing out the
version number in the same format as used for naming RPMS.

Signed-off-by: Gary Lowell  <gary.lowell@inktank.com>
Merge branch 'master' of http://github.com/ceph/autobuild-ceph
Merge branch 'master' of http://github.com/ceph/autobuild-ceph
Merge branch 'master' of http://github.com/ceph/autobuild-ceph
Merge branch 'master' of http://github.com/ceph/autobuild-ceph
build-ceph-rpm.sh:  Fix release candidate version

Version numbers for release candidate builds have -rc[1-9] suffix.
The '-' is an illegal character in rpm version strings. So, before
building, move the rc tag from the version string and add it to
the release string if it is not already there.  The rc tag does
need to be added to the source and setup lines since it is no longer
version.

Signed-off-by: Gary Lowell  <gary.lowell@inktank.com>