Fix invalid super() usage in memcache pool
Fix invalid super() usage in memcache pool

queue.Queue is an old-style class in stdlib and new-style in eventlet.
Because of that TypeError was raised when Keystone was launched using
Apache.

Change-Id: I5880ea75fc24de5b281238e6c37de75a8a617808
Closes-bug: 1419853

rushiagr/keystone,jamielennox/keystone,roopali8/keystone,idjaw/keystone,maestro-hybrid-cloud/keystone,jumpstarter-io/keystone,himanshu-setia/keystone,ajayaa/keystone,jumpstarter-io/keystone,rajalokan/keystone,rushiagr/keystone,promptworks/keystone,mahak/keystone,nuxeh/keystone,mahak/keystone,idjaw/keystone,openstack/keystone,rajalokan/keystone,rushiagr/keystone,roopali8/keystone,ilay09/keystone,mahak/keystone,promptworks/keystone,dstanek/keystone,cernops/keystone,vivekdhayaal/keystone,dims/keystone,jamielennox/keystone,dstanek/keystone,openstack/keystone,dims/keystone,jumpstarter-io/keystone,takeshineshiro/keystone,maestro-hybrid-cloud/keystone,takeshineshiro/keystone,ilay09/keystone,cernops/keystone,jonnary/keystone,jonnary/keystone,rajalokan/keystone,promptworks/keystone,dstanek/keystone,nuxeh/keystone,ajayaa/keystone,nuxeh/keystone,klmitch/keystone,openstack/keystone,klmitch/keystone,himanshu-setia/keystone,vivekdhayaal/keystone,ilay09/keystone,vivekdhayaal/keystone