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
Capitalize a few project names in configuring services doc

I was using the docs and noticed a few instances of project Names
were not capitalized.

Change-Id: I1edd5cd93e85c89bfff0f16eef6b8c5acf910760
Merge "Use oslo.i18n"
Merge "Capitalize a few project names in configuring services doc"