Install seabios-bin on rhel7

Without the files in the seabios-bin package Nova instances on rhel7
fail to start with an error about missing rom files.

Change-Id: I50b28e7a3564819d22e20854fd28d2fca48c0245
RabbitMQ element requires use-ephemeral

Change-Id: I3ebaecb0ccaf4b4e9b26c77f20da3fe7f7c4b749
Fix selinux permissions for non-primary MariaDB/Galera nodes

Galera nodes started after the bootstrap node will use rsync (and
a few other cmds) to sync up with master; yet on Fedora 20 this
is causing a number of selinux AVC denials.

Fedora bug is https://bugzilla.redhat.com/show_bug.cgi?id=1145619

Change-Id: Ifb97b3f92fefdef1d57c87907292aeb4a27c3a49
Closes-bug: 1373150
Add network-gateway element

Add a new element that allows a gateway device to be set.  Allows
setting a default route other than the one offered by the DHCP lease
from Neutron's DHCP. Useful for when a default route is needed that may
offer access to other networks that may be needed.

Change-Id: I62b874e37070e4ee2e4557fee0bb06faa4264483
Closes-Bug: 1354570
Merge "Install seabios-bin on rhel7"
Merge "Add network-gateway element"
Merge "Fix selinux permissions for non-primary MariaDB/Galera nodes"
Merge "RabbitMQ element requires use-ephemeral"