replace rest of q_exc to n_exc in code base

The following patch renames the rest of q_exc to n_exc which were
left when quantum was renamed to neutron.

used: find . -name "*.py"  -print | xargs sed -i 's/q_exc/n_exc/g'

Change-Id: I04041030694b28c400b6c9c552433f2eaa4a37ba
Closes-bug: #1287462
Imported Translations from Transifex

Change-Id: Ie6efde5d61d0c500fbbc45d715f605f4c316d166
Merge "replace rest of q_exc to n_exc in code base"
Merge "Imported Translations from Transifex"