[webapi] Add 10 P2 tests for Battery Status API

Impacted tests(approved): new 10, update 0, delete 0
Unit test platform: [Android]
Unit test result summary: pass 10, fail 0, block 0
Merge pull request #1298 from kangxu/kangxu/webapi/tct-batterystatus-w3c-tests/fixGap

[webapi] Add 10 P2 tests for Battery Status API