crm_res_running doesn't check properly if a resource is running

crm_res_running[0] doesn't work as expected, when a resource is running and the status is asked to pacemaker the output is like "resource XXX is running on: NODE-YY", so the the condition "opt_name in output" is always True, no matter the resource is running or stopped

Example using a nova-cloud-controller where res_nova_consoleauth is running, but crm_res_running doesn't detect it:

>>> import commands
>>> commands.getstatusoutput("crm resource status res_nova_consoleauth")
(0, 'resource res_nova_consoleauth is running on: juju-freyes-machine-6 ')
>>> import pcmk
>>> pcmk.crm_res_running('res_nova_consoleauth')
False

[0] http://bazaar.launchpad.net/~openstack-charmers/charms/trusty/hacluster/next/view/head:/hooks/pcmk.py#L50