[wrt] Change shell scripts license to BSD

- These scripts were orignially created in 2014
  checking by 'git log --follow'
- Indent shell script using 2 spaces following
  doc/Coding_Style_Guide_CheatSheet.md
- Fix a typo.
Merge pull request #1568 from zqzhang/wrt-license

[wrt] Change shell scripts license to BSD