In monasca-vagrant env the Keystone http_status metrics stop being sent after a while

[Roland Hochmuth]

Creat a monasca-vagrant environment
On my system, the metrics for the Keystone API seem to stop being sent after a while.
The http status alarm for Keystone end-up in an undetermined state and looking at Grafana you can see that the metrics have stopped.
Re-starting the monasca-agent on the devstack system get the metrics going again, but after a while, they seem to stop again.

Note, this only happens for the Keystone API. The http status metrics/alarms work for everything else.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/163095

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/163095
Committed: https://git.openstack.org/cgit/stackforge/monasca-agent/commit/?id=5f93eddfbf1565729ba34dd1c27efce31c62c04c
Submitter: Jenkins
Branch: master

commit 5f93eddfbf1565729ba34dd1c27efce31c62c04c
Author: Ryan Bak <email address hidden>
Date: Tue Mar 10 11:19:49 2015 -0600

    Fixes keystone endpoint check token failure

    Also improves logging for errors around keystone failures

    Change-Id: Ib2cc4aa0ebc1ad0ec2df7e68b770a30f4c18802c
    Closes-Bug: 1428807