This patch add the USER directive to the memcached container.
It also removes the -u from the command line to launch
memcached, since it will already be run as that use.
Change-Id: I87d782a424df99fe1b5694debafa3c0c4a9aba27
Partially-Implements: blueprint drop-root
Note, this is not in the inventories/site.yml as it will be a
transparent dependency of Swift.
Change-Id: Ic8c80072596594e646ece74ac0ce74c7000398ff
Partitially-Implements: blueprint ansible-swift