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/1108672
Signed-off-by: Vinzenz Feenstra <vfeenstr@redhat.com>