qa/tasks/vstart_runner.py: add kwargs parameter to ignore the ones it does not understand

qa/tasks/vstart_runner.py: add kwargs parameter to ignore the ones it does not understand

INFO:__main__:test_replay_create (tasks.cephfs.test_cap_flush.TestCapFlush) ... ERROR
INFO:__main__:Stopped test: test_replay_create (tasks.cephfs.test_cap_flush.TestCapFlush) in 22.251901s
INFO:__main__:
INFO:__main__:======================================================================
INFO:__main__:ERROR: test_replay_create (tasks.cephfs.test_cap_flush.TestCapFlush)
INFO:__main__:----------------------------------------------------------------------
INFO:__main__:Traceback (most recent call last):
INFO:__main__:  File "/data/ceph/qa/tasks/cephfs/cephfs_test_case.py", line 145, in setUp
INFO:__main__:    self.mounts[i].mount_wait()
INFO:__main__:  File "/data/ceph/qa/tasks/cephfs/mount.py", line 420, in mount_wait
INFO:__main__:    mount_options=mount_options)
INFO:__main__:TypeError: mount() got an unexpected keyword argument 'mountpoint'
INFO:__main__:
INFO:__main__:----------------------------------------------------------------------
INFO:__main__:Ran 1 test in 22.253s
INFO:__main__:
INFO:__main__:FAILED (errors=1)
INFO:__main__:

Fixes: https://tracker.ceph.com/issues/45300
Signed-off-by: Xiubo Li <xiubli@redhat.com>