Image Sync Updates

These updates allow the image sync script to work with OS Havana. 

While the process is still the same, meaning that the script will still have to be set as a CRON job, the script will now take messages from the "glance_notifications" queue place them into the "glance-image-sync%(hostname)s" queue and then performs all necessary jobs based on the message. When the job is complete the script will place the message back into the general OS "notifications" queue which will other OS APIs to perform actions on the message as intended.

Changes to the original  script are mainly in regards to flow and logging in addition to adding CLI help options as well as a verbose mode.