build: add systemd dependency to the glusterfs sub-package

Problem:
/bin/systemctl is not available at install time of primary glusterfs
package.

Solution:
Add %{?systemd_requires} to the glusterfs sub-package install time
requirements.

Replace all "Requires: systemd" and "Requires: systemd-units" with
%{?systemd_requires}. %systemd_requires is defined in
/usr/lib/rpm/macros.d/macros.systemd
systemd-units is provided by systemd.
Add BuildRequires: systemd for the definition of %systemd_requires
as well.

> BUG: 1399031
> Reviewed-on: http://review.gluster.org/15936
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: Raghavendra Talur <rtalur@redhat.com>
> Smoke: Gluster Build System <jenkins@build.gluster.org>
(cherry picked from commit 6138f4a2fc835bc94aa66543f5aee4f92081f1c7)

Change-Id: I980ece7d538ea177ca6b0e70c1c169e6f04c46d4
BUG: 1400635
Signed-off-by: Milind Changire <mchangir@redhat.com>
Reviewed-on: http://review.gluster.org/15999
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>

0 files changed, 0 insertions, 0 deletions