[KYUUBI-SHADED #6] Fix RAT check for submodules
### _Why are the changes needed?_
### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [ ] [Run test](https://kyuubi.readthedocs.io/en/master/develop_tools/testing.html#running-tests) locally before make a pull request
Closes #6 from pan3793/rat.
cfb4b2d [Cheng Pan] rat
Authored-by: Cheng Pan <chengpan@apache.org>
Signed-off-by: Cheng Pan <chengpan@apache.org>
1 file changed
