[Tizen][Runtime] Always use [tizen_app_id] on tizen.

For xpk, [tizen_app_id] = xwalk.[GenerateId or GenerateIdForPath]
For wgt, [tizen_app_id] = Get from config.xml
Deprecate old 'url' field, remove dead code and some refactorings
Merge pull request #2261 from CooderIan/sort_out_id

[Tizen][Runtime] Always use [tizen_app_id] on tizen.
Merge pull request #2271 from kenchris/xwalk_refac

Deprecate old 'url' field, remove dead code and some refactorings
Bump version to 8.37.186.0
[Tizen] gbs-build crosswalk8 rpm fail

Exclude unnecessary directory android_tools when build for tizen.

BUG=XWALK-2224