[webapi] Update 15 TCs and delete 4 TCs for webrtc

Impacted TCs num: New 0, Update 15, Delete 4
Unit test Platform: IVI
Tizen test result summary: Pass 7, Fail 4, Block 4

Fail Reason: 
1. The initial value of the binaryType attribute is "blob"
2. The candidate parameter is malformed throw a exception

Block Reason:
Cannot catch oniceconnectionstatechange Event

Delete Reason:	
Duplicate TCs