Ignore etc/nova/nova.conf.sample

Since we have already remove this sample file, and provided a way
to generate it, it should be no longer tracked.

Change-Id: I786812d039d96044ff5040d09f5472051966f74f
Closes-Bug: #1320150
Imported Translations from Transifex

Change-Id: I00d53eb9b5b08b272f8dccf7d750d30499103302
Merge "Ignore etc/nova/nova.conf.sample"