ovirt-node-plugin-vdsm: Bump release to 0.1.1-6

Changes:
- engine_page: replace != None to is not None
- engine_page: valid.Empty() handling None
- engine_page: fix logic to show fingerprint msg
- engine_page: replace TBD string

Change-Id: I97b8746955272ac6bb0f4f4398fe8995753226a0
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>