LU-5760 rpm: remove Red Hat specific check for init scripts

LU-5760 rpm: remove Red Hat specific check for init scripts

The issue with build under mock-based environments is related to
a sloppy heuristic of checking for the existence of checking for
two files under /etc, and assuming that is a good way to identify
a Red Hat system. We had a concern about this for other systems.

So, let's remove this Red Hat specific check of /etc files.

Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Change-Id: Ibc6af75ebea51b39d5ff4c8473db2e3828ffea68
Reviewed-on: http://review.whamcloud.com/12377
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Christopher J. Morrone <morrone2@llnl.gov>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>