For possible config options see docs
https://docs.openstack.org/keystonemiddleware/latest/middlewarearchitecture.html#memcache-protection



Closes-bug: #1850733
Signed-off-by: Roman Krček <roman.krcek@tietoevry.com>
Change-Id: I169e27899f7350f5eb8adb1f81a062c51e6cbdfc