qa/vstart_runner.py: make run()'s interface same as teuthology's run

qa/vstart_runner.py: make run()'s interface same as teuthology's run

Arguments accepted by method run in teuthology should be exactly same as
that of arguments accepted by vstart_runner.py's method run to prevent
test failure with teuthology due to silly argument mismatch.
Teuthology's entry method run expects **kwargs, therefore so should
vstart_runner.py's run.

Fixes: https://tracker.ceph.com/issues/44117
Signed-off-by: Rishabh Dave <ridave@redhat.com>