Reusing one memcached connection
instead of making 1 connection per Cache::get/set/delete call this saves the
memcached connection as a static variable to avoid DOSing your memcached
server if you have many cache calls on the same page
Reuse one Redis connection similar how we are doing so in the memached storage class
Merge pull request #1465 from tomschlick/memcached-connections

Use one memcached or redis connection for all Cache operations