Run token-flush every minute

This patch creates cron job for Keystone token-flush.

Change-Id: I20c1d6eb0d3e9852e001fbfd12703ad18be84dcd
Fixes: rhbz#1029671
(cherry picked from commit 85033036a223770bdcae9f3f66c5cdc0fb250a21)
Merge "Run token-flush every minute" into havana