* RHEL6 does not include Open vSwitch in the default repos, but it
is available via the RDO repo. This patch automatically
configures the RDO repo for RHEL6.
* The openvswitch package is now listed as an rpm dependency to
ensure it can be cached by a pre-built CI environment.
Change-Id: I8f93f53039cca4ff29bcb91720be7bb047b3ed8a