Switch over to oslosphinx

oslosphinx is the new name of oslo.sphinx

Closes-Bug: #1277168
Change-Id: I4cebcffb36724d699147a26eb1132b122cfe669c
Remove English compiled catalogs after compilemessages

./run_tests.sh --compilemessages compiles all languages including
English, but English is the source language and there is no need
to have compiled message catalogs for English.

Also this commit update the description of --makemessages.

Change-Id: I30cf4336cc796e8e3bea71120b6c75ce40aaf888
Closes-Bug: #1261290
Clarify description string for image metric

This metric seems to have an existential crisis.
Change to more succinct "Image existence check"

Change-Id: I953c55214e73bb93c452b25f97960e9637f1008c
Closes-Bug: #1292937
Remove the update default quotas feature

The default quota panel has been moved to a tab in the system
info panel.
The update default quotas feature has been removed.
The cinder quota-class methods have been removed to keep consistency.
The test cases and the apis for nova and cinder have been modified
according the change.

This change is done to support the change:
I1110022d6f628d03aaf363da707f2d2ef1600437

Change-Id: I193c7209d9681b6d69afe0d996153ac86850d243
Closes-Bug: #1292589
Merge "Clarify description string for image metric"
Merge "Remove English compiled catalogs after compilemessages"
Merge "Switch over to oslosphinx"
Merge "Remove the update default quotas feature"