Remove testharness reference from Vibration manual tests

- The testharness will result in 'Harness status: TIMEOUT'
  error info though the tests pass
- Remove html xmlns attribute which is optional in HTML5
- Remove commentted lines too
Rename [] to empty-array in test filename and remove manifest.txt

- The [] in filename gets 404
- The manifest.txt is useless
Use explicit_done for user-interaction test to avoid TIMEOUT
Merge pull request #1071 from zqzhang/zqzhang/vibration-update

Refine Vibration user-interaction tests to avoid TIMEOUT