Initial support for Fedora 21

Initial support for Fedora 21.  Add f21 to the distribution lists for
rpms, ensure "mariadb" is used over "mysqld" and enable it in the
distro check, as we have several reports of it working.

Tested with [1]

[1] http://download.fedoraproject.org/pub/fedora/linux/releases/test/21-Beta/Cloud/Images/x86_64/Fedora-Cloud-Base-20141029-21_Beta.x86_64.qcow2

Change-Id: I97cbede806e5c00363c7174fa1e9f286de96aab6
diff --git a/files/rpms/neutron b/files/rpms/neutron
index 2c9dd3d..f2473fb 100644
--- a/files/rpms/neutron
+++ b/files/rpms/neutron
@@ -12,8 +12,8 @@
 python-greenlet
 python-iso8601
 #rhel6 gets via pip
-python-paste        # dist:f19,f20,rhel7
-python-paste-deploy # dist:f19,f20,rhel7
+python-paste        # dist:f19,f20,f21,rhel7
+python-paste-deploy # dist:f19,f20,f21,rhel7
 python-qpid # NOPRIME
 python-routes
 python-sqlalchemy