Add metadata option to Nova Create API Wrapper

The Nova Create API Wrapper doesn't pass through
the metadata variable, requring any dashboards
that spin up VMs with metadata to use the python
libraries directly.

Closes-Bug: 1347824

Change-Id: Ib4cb98e1c510466edc7558697f9d015e80b882ab
Imported Translations from Transifex

Change-Id: I87314f618e1908b2b22aebffce4880f031a6ab99
Merge "Add metadata option to Nova Create API Wrapper"
Merge "Imported Translations from Transifex"