Add a resource_facade intrinsic function to HOT

Add a native version of the function, rather than continue to rely on
Fn::ResourceFacade from the Heat-flavoured-cfn templates.

Closes-bug: #1299205

Change-Id: Iee118aeaa72d59e4d6a27ed487b99e9aba9779cd
Fix Jenkins translation jobs

The jobs heat-propose-translation-update and
heat-upstream-translation-update do not update from
transifex since our po files contain duplicate entries where
obsolete entries duplicate normal entries.

Remove all obsolete entries to fix the jobs.

Change-Id: I2071e3a792d107840449bbfe39e3a540ea1b626f
Closes-Bug: #1299349