[Android][REG] Packaging tool does not work with python 3.0+

1. command output is a bytes-like object in python3.0+,
re.findall can't use a string pattern on a bytes-like object,
encode the bytes-like object to str to fix that.
2. map function will return a map object in python3.0+,
'map' object has no attribute 'extend',
not use map function to fix that.

BUG=https://crosswalk-project.org/jira/browse/XWALK-2303
[Android] The LaunchScreen dialog follows the activity window flags

Instead of check whether the activity is in fullscreen mode, just follow the activity window flags.

BUG=XWALK-2294
[Android] Fix fullscreen not working issue on Android versions < 4.2

Change the values-v17 to values-v14, as we support Android versions >= 4.0

BUG=XWALK-2307
Merge pull request #2304 from kurli/manifest_fullscreen

[Android] Fix fullscreen not working issue on Android versions < 4.2
Merge pull request #2302 from jinbang/support_python3.0+_byte_map

[Android][REG] Packaging tool does not work with python 3.0+
Merge pull request #2296 from kurli/launchscreen_immersive

[Android] The LaunchScreen dialog follows the activity window flags