Add syslog support to the glance module

Change-Id: Ibe3a22a996016d1a80efb69fd7d401d1834d011b
Change keystone tenant and user default

Currently, the default auth tenant and user for
glance are set to admin. This is not only
inconsistent with the rest of the modules (where
the tenant defaults to services and the user defaults
to the name of the service: ie: glance), it
is also inconsistent with the glance::keystone::auth
class.

This patch changes the defaults to services and glance
for both the api and registry service.

Change-Id: I3bd6390183c88213ec4bc289ca6be6f2d9c8bdd2
Merge "Add syslog support to the glance module"