Add RHEL7 beta support

RHEL7 still in beta status, so it will require the FORCE option,
until the GA release.

The main notable difference from another RHEL family members, it does
not have the mysql alias for the mariadb.

Change-Id: Ic90bb6c3dd9447fc80453c3dc1adb22cdfc6226f
diff --git a/files/rpms/glance b/files/rpms/glance
index fffd9c8..785ce25 100644
--- a/files/rpms/glance
+++ b/files/rpms/glance
@@ -9,8 +9,8 @@
 python-devel
 python-eventlet
 python-greenlet
-python-lxml         #dist:f18,f19,f20
-python-paste-deploy #dist:f18,f19,f20
+python-lxml         #dist:f18,f19,f20,rhel7
+python-paste-deploy #dist:f18,f19,f20,rhel7
 python-routes
 python-sqlalchemy
 python-wsgiref