Add some authtoken related attributes

This change adds some attributes into the cookbook so
that they are configurable. It mainly includes:
cafile, memcached_servers, memcache_security_strategy,
memcache_secret_key, insecure and hash_algorithms.

Change-Id: I6d38db321da2d86265bace3d36c68ddcb196ed61
Closes-Bug: #1372315