Add the test case of checking if the LLDP is still enabled after rebooting
Use CLI script to enable/disable LLDP
Set LLDP holdtime/ifname/interval/management by CLI
The test cases of setting LLDP interval and hold time by AP console
Add the test case of enabling LLDP by Web GUI
The test cases of setting LLDP holdtime/interval/management on GUI
Modify API to set LLDP on Web GUI
Set original LLDP parameters to AP after SCG's applying parameters to AP
Set AP to factory and then join SCG
Fix some bugs
Merge from Perforce
1. Add the test cases of enabing/disaling LLDP and setting LLDP inteval/holdtime/mamagement"
2. Fix the parameters setting conflict between SCG and AP

Conflicts:
	u2/lldp/SetLLDPHoldTime.py
	u2/lldp/lldp_test_suite_regression.py