Updated openstack/openstack
Project: openstack/keystone  06ce40d6d036f927ff59b00f376d9b374e70c782

Speed up memcache lock

Simplify sleep timeouts calculation removing progressive scale.

Closes-bug: #1395688
Change-Id: I0f1b620df9631a4b081e8c0be93d8a9b2d60e105