Refactor skip_because decorator
Refactor skip_because decorator

skip_because should be skipped by default.
The skip param is not needed here , condition is set to True always
In case condition is False we do not skip .

I think it reduces the nested if and overhead.
Making the code clear and readable

Change-Id: Ie24263bb73805001ba85c27073f6a7de31793323

openstack/tempest,openstack/tempest