[wrt] Update tcs and script for wrt-packertool-android-tests

Impacted tests(approved): new 88, update 174, delete 0
Unit test platform: [Android]
Unit test result summary: pass 262, fail 0, block 0
[webapi][XWALK-2340] Change 39 TCs status to manual

- Change Reason: Need to confirm dialog during running these TCs in android.

Impacted TCs num(approved): New 0, Update 39, Delete 0
Unit test Platform: [Andriod]
Andriod test result summary: Pass 37, Fail 2, Blocked 0
[webapi][DeviceCapabilities] Use correct name of Event attribute.

Spec bugs: StorageUnit and DisplayUnit are type name.
The attribute name should be `storage` and `display`.
Add python.py to tools/build

Signed-off-by: Hao yunfeix <yunfeix.hao@intel.com>
Remove webkit prefix for page visibility

Impacted tests(approved): new 0, update 13, delete 0
Unit test platform: IVI
Unit test result summary: pass 13, fail 0, block 0
Merge pull request #749 from xiaojunwu/xioajunwu/pagevisibility-remove-prefix

Remove webkit prefix for page visibility
Merge pull request #748 from haoyunfeix/yunfei/add-pack-python-file

Add python.py to tools/build
Merge pull request #747 from legendlee1314/fixbug

[webapi][DeviceCapabilities] Use correct name of Event attribute.
Merge pull request #746 from JianfengXu/xujf/2340

[webapi][XWALK-2340] Change 39 TCs status to manual
Merge pull request #716 from kangxu/kangxu/wrt/wrt-packertool-android-tests/addTcs

[wrt] Update tcs and script for wrt-packertool-android-tests