Updated Memcache test to call isAvailable().
Updated Memcache test to call isAvailable().

csburton/Stash,csburton/Stash,tedious/Stash,graphis/Stash,andrerom/Stash,theUniC/Stash,AndrewCarterUK/Stash,bankiru/Stash,localheinz/Stash,jaredtking/Stash,alawnchen/Stash,graphis/Stash,localheinz/Stash,theUniC/Stash,AndrewCarterUK/Stash,jaredtking/Stash,andrerom/Stash,alawnchen/Stash,tedious/Stash,bankiru/Stash