rpm: 95-ceph-osd-alt.rules is not needed for centos7 / rhel7

The || instead of && had it always installed. That was fixed in EPEL
already.

http://tracker.ceph.com/issues/9747 Fixes: #9747

Signed-off-by: Loic Dachary <loic-201408@dachary.org>
Merge pull request #2706 from dachary/wip-9747-ceph-spec

rpm: 95-ceph-osd-alt.rules is not needed for centos7 / rhel7

Backport: giant, firefly
Reviewed-by: Sage Weil <sage@redhat.com>