Modify uninstall steps in case app is installed on an external memory

Modify uninstall steps in case app is installed on an external memory

[Issue#]   N_SE-53790
[Problem]  Re-install fails after uninstall app which was installed on external memory.
[Cause]    When uninstalling an app on external memory, unexpected error occurred.
            : SD card isn't inserted or unmounted
           In this case, wrt-installer skips to remove directory in internal memory.
           The remaining internal directory caused "application already existed" error.
[Solution] Change uninstall work-flow.
           Before : Remove the information to only an external memory (e.g., SD card).
           After  : Remove the information on both internal and external memory.

Change-Id: If7a4fe063b80ecdb6a6f5b60f2d95bd48e9cb284