[ivi-tct][webapi] Add new clipboard suite

- Add constructor of ClipboardEvent interface tests

Impacted tests(approved): new 4, update 0, delete 0
Unit test platform: [IVI] crosswalk-10.39.233, t-e-c 0.120
Unit test result summary: pass 0, fail 4, block 0
Merge pull request #1397 from xinliux/clipboard-new

[ivi-tct][webapi] Add new clipboard suite