Merge from Perforce
Fix the script issue in the Band Switch test cases
Merge from Perforce
Merge branch 'debug'
Add the Band Balancing test cases:
1. Check default band balancing value.
2. Modify band balancing value.
3. Setup band balancing in zone while WLAN's enabling band balancing.
4. Setup band balancing in zone while WLAN's disabling band balancing.