Purges expired keystone tokens
Purges expired keystone tokens

Purges expired tokens every hour and logs the output.

Change-Id: I7fb02ab81b8583132ab8dbb74857a8015300e0f9

openstack/training-guides,openstack/training-guides,Nabs007/training-guides,harrisonfeng/training-guides,Nabs007/training-guides,Nabs007/training-guides,harrisonfeng/training-guides,harrisonfeng/training-guides