[webapi][XWALK-2080] Add onload delay time and update redirect cgi file

- Add onload delay time for 4 fail TCs and update redirect.cgi because of error optional arguments.

Impacted TCs num(approved): New 0, Update 4, Delete 0
Unit test Platform: Android
Android test result summary: Pass 4, Fail 0, Blocked 0
Merge pull request #448 from xinliux/xinliux/webapi/XWALK-2080

[webapi][XWALK-2080] Add onload delay time and update redirect cgi file