Revert "reduce default lease time to 5 minutes"
Revert "reduce default lease time to 5 minutes"

We have a fix in Nova which should make this unessessary,
revert to see if that's true.

This reverts commit 61aa0e9f1968c9991dee7bb5aec9a2a63ac0339d.

Change-Id: If109af452ad583417e3a3a3ef1c9b545f1ec9b89

bswartz/devstack,Mahito/devstack,openstack-dev/devstack,group-policy/devstack,dtroyer/devstack,bswartz/devstack,noironetworks/devstack,group-policy/devstack,richliu/devstack,dirkmueller/devstack,bigswitch/devstack,dtroyer/devstack,samgoon/devstack,bigswitch/devstack,nawawi/openstack,dirkmueller/devstack,samgoon/devstack,richliu/devstack,Mahito/devstack,nawawi/openstack,noironetworks/devstack,openstack-dev/devstack