Filter Windows HotFixes by ReleaseType value

Non-english releases contain a field 'ReleaseType' which contains
an english string 'Security Update', 'Hotfix' or 'Update'
Additionally we're checking for 'ParentKeyName' which contains
'OperatingSystem' in case of an update.

Change-Id: I4ab40ed538a48d79f30ee300d791ce4636371634
Bug-Url: https://bugzilla.redhat.com/1103710
Signed-off-by: Vinzenz Feenstra <vfeenstr@redhat.com>
No output when guest agent already running or stopped on RHEL5/6

When the guest agent is already running and 'service ovirt-guest-agent start'
is executed it no longer prints anything.
The same for 'service ovirt-guest-agent stop' when the agent is already
stopped.
Additionally restart will use the same behaviour

Change-Id: Id27e5b9f91b675fb5f2d2be8d5d1663efd34293f
Bug-Url: https://bugzilla.redhat.com/1028381
Signed-off-by: Vinzenz Feenstra <vfeenstr@redhat.com>