devtool: Add --remove-work option for devtool reset command
Enable --remove-work option for devtool reset command that allows user
to clean up source directory within workspace.
Currently devtool reset command only removes recipes and user is forced
to manually remove the sources directory within the workspace before
running devtool modify again.
Using devtool reset -r or devtool reset --remove-work option, user can
cleanup the sources directory along with the recipe instead of manually
cleaning it.
syntax: devtool reset -r <recipename>
Ex: devtool reset -r zip
