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