[wrt] Add config.xml in packagemgt wgt

Impacted tests(approved): new 0, update 9, delete 0
Unit test platform: [Tizen IVI]
Unit test result summary: pass 9, fail 0, block 0
Merge pull request #654 from haoxli/haoxli/wrt/packmg-wgt-config

[wrt] Add config.xml in packagemgt wgt