[usecase-wrt] update version filed to config.xml for wgt

[Detailed commit message (if have)]
Impacted TCs num(approved):
1. update manifest,install/launch/uninstall pass
2. update wgt config.xml add version filed ,install/launch/uninstall pass
Unit test platform: [tizen]
Merge pull request #737 from linshen/wrt/update-manifest-fileds

[usecase-wrt] update version filed to config.xml for wgt