Fixes Opt types in glance/notifier/notify_kombu.py

Changed rabbit_retry_backoff and rabbit_retry_max_backoff to IntOpt.

Fixes bug #1201697

Change-Id: Ia1a74b6bb2873e59677a7fea6652a6c006f38175
BaseException.message is deprecated since Python 2.6

PEP 352 deprecated the message attribute of the BaseException class.
Using the message attribute will result in warnings like this:

DeprecationWarning: BaseException.message has been deprecated as of Python 2.6

Using unicode(exc) is the suggested replacement.

Change-Id: Ie322aaa69c025ae5bf39d00f7e3487fe2527545b
Merge "Fixes Opt types in glance/notifier/notify_kombu.py"
Migrate to PBR for setup and version code.

Fixes bug 1179007

Also, sync with global requirements because we can't do it in two steps.

Change-Id: If1c687f874272b9d9569af9dd1e5cb4457308f5c