Bug 1100466 - Enable the mongodb cartridge
<openshift.ks> Override EXTERNAL_ETH_DEV in node.conf if needed

If CONF_INTERFACE/interface is specified override EXTERNAL_ETH_DEV in
node.conf.

refactor iface to interface to match variable/parameter naming
conventions
Merge pull request #370 from detiber/fixNodeInterface

<openshift.ks> Override EXTERNAL_ETH_DEV in node.conf if needed
Merge remote-tracking branch 'origin/enterprise-2.1' into enterprise-2.1
Merge pull request #361 from brenton/BZ1100466

Bug 1100466 - Enable the mongodb cartridge