Drop py27 from memcache testing. (#1018)

Author: umaannamalai

tox.ini

@@ -57,7 +57,7 @@ envlist =
     kafka-messagebroker_kafkapython-{py27,py38}-kafkapython{020001,020000},
     kafka-messagebroker_kafkapython-{pypy27,py27,py37,py38,pypy38}-kafkapythonlatest,
     memcached-datastore_bmemcached-{pypy27,py27,py37,py38,py39,py310,py311,py312}-memcached030,
-    memcached-datastore_memcache-{py27,py37,py38,py39,py310,py311,py312,pypy27,pypy38}-memcached01,
+    memcached-datastore_memcache-{py37,py38,py39,py310,py311,py312,pypy38}-memcached01,
     memcached-datastore_pylibmc-{py27,py37},
     memcached-datastore_pymemcache-{py27,py37,py38,py39,py310,py311,py312,pypy27,pypy38},
     mongodb-datastore_pymongo-{py27,py37,py38,py39,py310,py311,py312,pypy27}-pymongo03,