Fix for issue 861

Added service "enable" block to default recipe of the the
memcached-openstack wrapper cookbook.

Issue:
https://github.com/rcbops/chef-cookbooks/issues/861
(cherry picked from commit 642a1a40ceb805e09393e060da074daaae9a8893)
Merge pull request #6 from claco/v4.2.3rc

Merged automatically by jenkins after successful build test