Revert "Disable Metadata write operations on v1.1"

This reverts commit 23fa8e80c7a24abdfffadded1bc6eda0c5c071d0.

Based on the feedback we got from the summit, it seems that removing
queues and their metadata is not a good idea.

I'd like to revert this patch until we either choose to go 'The stubborn
way' or accept this actually makes sense.

Conflicts:
	marconi/queues/transport/wsgi/v1_1/metadata.py

Change-Id: Ic407e104a4108acc262a5a35c317ef6a9fc529a4
Merge "Revert "Disable Metadata write operations on v1.1""