build: fix RHEL 7 build issue

Glusterfs build on RHEL 7 fails with "Installed (but unpackaged)
file(s) found".  This patch fixes it.

BUG: 1058188
Change-Id: I8f37935b75ba02d085e75a66cdbc4017d82faa2e
Signed-off-by: Bala.FA <barumuga@redhat.com>
Reviewed-on: http://review.gluster.org/7557
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Tested-by: Niels de Vos <ndevos@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>