make test_cql runnable in parallel
make test_cql runnable in parallel

i might have found an elusive bug in c* that manifests more readily with
multiple instances of this test suite, so i've modified test_cql so that
it uses unique keyspace names for all of its work. any number of
multiple instances should be able to work without interrupting each
other now (at least, on 1.1, with its concurrent schema migrations)

pcmanus/python-cql,CanWeStudio/cassandra-dbapi2,diezguerra/cassandra-dbapi2,stanhu/cassandra-dbapi2,mshuler/cassandra-dbapi2,pandu-rao/cassandra-dbapi2,flowroute/cassandra-dbapi2,iGivefirst/cassandra-dbapi2,iflatness/cql,josh-mckenzie/cassandra-dbapi2,maraca/cassandra-dbapi2,EnigmaCurry/cassandra-dbapi2