Update python-pymemcache to 3.5.0 and python-dogpile-cache to 1.1.5
Update python-pymemcache to 3.5.0 and python-dogpile-cache to 1.1.5

This version will be needed to fix issues with the lib pymemcache
and so it will allow us to introduce the TLS support for memcached

Change-Id: If547ed6fe0cecd307a3b48f81f52ddebae87b600

redhat-openstack/rdoinfo