/usr/share/rhn/virtualization/poller.py complains about non-started libvirtd

Issue

• /usr/share/rhn/virtualization/poller.py (run as a cron job) complains about non-started libvirtd, which should not be case.
• There are cases with DRBD + Heartbeat/Corosync/Pacemaker where libvirtd is only started on the active/primary one while the hot-standby server never has a libvirtd running. And there it does not make any sense to receive these errors in regular intervals via e-mail.
• Please either run that script if libvirtd is running or check within that script if libvirtd is running and do not fail loudly, but silent.

libvir: RPC error : Failed to connect socket to '/var/run/libvirt/libvirt-sock-ro': No such file or directory
Warning: Could not retrieve virtualization information!
        libvirtd service needs to be running.
libvir: RPC error : Failed to connect socket to '/var/run/libvirt/libvirt-sock-ro': No such file or directory
Traceback (most recent call last):
  File "<stdin>", line 301, in <module>
  File "/usr/share/rhn/virtualization/domain_directory.py", line 70, in __init__
    self.conn = libvirt.openReadOnly(None)
  File "/usr/lib64/python2.6/site-packages/libvirt.py", line 247, in openReadOnly
    if ret is None:raise libvirtError('virConnectOpenReadOnly() failed')
libvirt.libvirtError: Failed to connect socket to '/var/run/libvirt/libvirt-sock-ro': No such file or directory

• /usr/share/rhn/virtualization/poller.py script should execute only when libvirtd is stopped.