[webapi] Update cases for Network Information API

- New Spec: http://w3c.github.io/netinfo

Impacted tests(approved): new 2, update 1, delete 11
Unit test platform: [Android]
Unit test result summary: pass 2, fail 2, block 0

Comment: type and downlinkMax don't exist in NetworkInformation,
but as spec describe, 2 attributes should exist
[usecase][xwalk-726] Add one usecase advertising to usecase

Impacted TCs num(designed): New 1, Update 0, Delete 0
[webapi] Remove 2 tests due to spec update for rawsockets

Spec Link: http://www.w3.org/TR/raw-sockets/
Merge pull request #1040 from kangxu/kangxu/webapi/tct-netinfo-w3c-tests/update

[webapi] Update tests for Network Information API to align with Chromium implementation
Merge pull request #1129 from kangxu/kangxu/webapi/webapi-rawsockets-sysapps-tests/updateCases

[webapi] Remove 2 tests due to spec update for rawsockets
Merge pull request #1121 from wanghongjuan/wanghongjuan/usecase/xwalk-726

[usecase][xwalk-726] Add one usecase advertising to usecase
Update files using http://w3c-test.org/

Because W3C has refactored http://w3c-test.org/,
these links are not valid any more.
Just replace them with links to W3C github repos.

We still needs to check the integrated files
to reflect the latest W3C github repos.
Remove unreferenced files linking to http://w3c-test.org/
Correct test origination of Geolocation test suites

However these tests have been deprecated by
https://github.com/w3c/web-platform-tests/tree/master/geolocation-API

We need to update the test suites too.
Merge pull request #1132 from zqzhang/w3c-test.org

Check files linking to http://w3c-test.org/