[wrt][WEBQA-165] Update source code for wrt-packertool-android-tests

Support test on arm device
Merge pull request #1387 from wanghongjuan/wrt/packertool-improve1

[wrt][WEBQA-165] Update source code for wrt-packertool-android-tests
[wrt] Add priority to tests.full.xml
Merge pull request #1390 from wanghongjuan/wrt/manifest-tizen-priority

[wrt] Add priority to tests.full.xml