tbio: fixes

* Wait until udev creates /dev/tbio. If udev can not create
  the node file in a defined timeout, create it manually.
* Clean /dev/tbio after test execution, if /dev/tbio was created
  manually.

Signed-off-by: Stanislav Kholmanskikh <stanislav.kholmanskikh@oracle.com>
Acked-by: Cyril Hrubis <chrubis@suse.cz>