Add GlanceLogFile and GlanceNotifierStrategy

Expose 2 new parameters to control glance configuration:
- GlanceLogFile
- GlanceNotifierStrategy

This will allow the glance configuration options log_file and
notifier_strategy to be set in glance-api.conf and glance-registry.conf

Change-Id: I1af1ecfdfe0859f2baba4579aab6e947a2a54308
Merge "Add GlanceLogFile and GlanceNotifierStrategy"