More memcache options can be set in the memcache.conf or proxy-server.conf
* connect_timeout
* pool_timeout
* tries
* io_timeout
Options set in proxy-server.conf are considered more specific to the memcache
middleware.
DocImpact
Change-Id: I194d0f4d88c6cb8c797a37dcab48f2d8473e7a4e