LDAP: Added documentation for debug_level option

Change-Id: Ia5646ebae049eec296bd10826dfd57bf6b7761af
Closes-Bug: #1319564
Update docs to reflect new db_sync behaviour

In the extension specific configuration docs, we ask that the user
always migrate the extension, however now that we migrate certain
extensions by default, we can mark those steps as optional.

Change-Id: I3d2419786d1f6c25b69c29629a47892fa682129d
Add revocation extension to default pipeline

Since this extension will have an impact across many projects
within OpenStack, it should be on by default.

Change-Id: Id9ff5e4e22125c54b5793bc42819fb4d1ef6dc90
Use oslo.i18n

Keystone was using the I18N functions from oslo-incubator. With
this change, Keystone uses the new oslo.i18n library.

The tests were adapted to not use internal symbols because these are
subject to change.

Change-Id: I1b13fcc630952695424fccd91bcd157d702851f1
Merge "LDAP: Added documentation for debug_level option"
Merge "Update docs to reflect new db_sync behaviour"
Merge "Add revocation extension to default pipeline"
Merge "Use oslo.i18n"