force message buffers to strings before decoding
force message buffers to strings before decoding

See Section "Buffer Objects:" in
http://kombu.readthedocs.org/en/latest/userguide/serialization.html

Conflicts:
	worker/worker.py

openstack/stacktach,stackforge/stacktach,openstack/stacktach,openstack/stacktach,openstack/stacktach,stackforge/stacktach,stackforge/stacktach,stackforge/stacktach