[Package] Implementation of Tizen Package API

This branch includes a fully functional implementation of Tizen Package API. 

API specification can be found at:
https://developer.tizen.org/dev-guide/2.2.0/org.tizen.web.device.apireference/tizen/package.html

BUG=XWALK-443
```
int ret = (uid != GLOBAL_USER) ?
    pkgmgr_pkginfo_get_usr_pkginfo(pkg_id, uid, &handle) :
    pkgmgr_pkginfo_get_pkginfo(pkg_id, &handle);
```