[webapi][XWALK-2312] Fixed vconftool permission for geoallow

- vconftool command need root permission, so excute this command as pre-condition
- Remove testconfig tests.full.xml and tests.xml not accepteable TBD

Impacted TCs num(approved): New 0, Update 0, Delete 0
Unit test Platform: Tizen IVI
Tizen test result summary: Pass 99, Fail 105, Blocked 7
Merge pull request #743 from xinliux/xinliux/webapi/XWALK-2312

[webapi][XWALK-2312] Fixed vconftool permission for geoallow