Raising glance logging levels

This change complements glance change #106776 by raising some logging
levels and fixing some of the translations of logging.

Related to bp refactoring-glance-logging
Closes-Bug: #1336955

Change-Id: Ib547f4603025ebe4f6c055779032ab4064784490
Change Glance to use i18n instead of gettextutils

Changing all Glance files to use i18n instead of gettextutils for log
translations.

Finishes bp refactoring-glance-logging

Change-Id: I90d6ab4f7e09f4e7591921f9526de6370ebdb789
Merge "Raising glance logging levels"
Merge "Change Glance to use i18n instead of gettextutils"