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/swift b/files/rpms/swift
index 32432bc..72253f7 100644
--- a/files/rpms/swift
+++ b/files/rpms/swift
@@ -9,7 +9,7 @@
 python-greenlet
 python-netifaces
 python-nose
-python-paste-deploy # dist:f18,f19,f20
+python-paste-deploy # dist:f18,f19,f20,rhel7
 python-simplejson
 python-webob
 pyxattr