Implements queue, message and claim controllers for Redis

This patch implements the standard controllers for the redis
storage driver. It has been tested against a localhost Redis
server with ZAQAR_TEST_REDIS=1.

Change-Id: Ib7c100afd11a0410c3f241c1925d5aaf172ce6a8
Partially-Implements: blueprint redis-storage-driver
Merge "Implements queue, message and claim controllers for Redis"