core:remove single unknown tasks from the task(817817)
core:remove single unknown tasks from the task(817817)

https://bugzilla.redhat.com/show_bug.cgi?id=817817

Modifying relevant SP handling Job/Step to filter Job/Step with unknown
status.

Change-Id: I23d0b2dd1f2d07393c49e705a657cd97c9106c7e
Signed-off-by: Eli Mesika <dc8a2a200abf66067593de2e51fee9376f06ea0f@redhat.com>

walteryang47/ovirt-engine,yingyun001/ovirt-engine,walteryang47/ovirt-engine,yapengsong/ovirt-engine,OpenUniversity/ovirt-engine,OpenUniversity/ovirt-engine,halober/ovirt-engine,yingyun001/ovirt-engine,OpenUniversity/ovirt-engine,yapengsong/ovirt-engine,zerodengxinchao/ovirt-engine,eayun/ovirt-engine,eayun/ovirt-engine,walteryang47/ovirt-engine,yapengsong/ovirt-engine,yapengsong/ovirt-engine,derekhiggins/ovirt-engine,walteryang47/ovirt-engine,yingyun001/ovirt-engine,zerodengxinchao/ovirt-engine,zerodengxinchao/ovirt-engine,derekhiggins/ovirt-engine,zerodengxinchao/ovirt-engine,eayun/ovirt-engine,derekhiggins/ovirt-engine,zerodengxinchao/ovirt-engine,yingyun001/ovirt-engine,eayun/ovirt-engine,eayun/ovirt-engine,walteryang47/ovirt-engine,OpenUniversity/ovirt-engine,yingyun001/ovirt-engine,derekhiggins/ovirt-engine,halober/ovirt-engine,halober/ovirt-engine,OpenUniversity/ovirt-engine,halober/ovirt-engine,yapengsong/ovirt-engine