addon-install would keep the context of addon installation.
addon-reinstall would then reinstall it from the same place.

Example:
addon-install without arguments searches the current directory's project.
it installs org.jboss:foo,1.0
Then I want to reinstall, the project is alredy 1.1
So `addon-reinstall org.jboss:foo` will remove the current addon of the same G:A and install it from the same project directory as last time (possibly different than current working dir). This is a bit magical, but that's the way addon-* work anyway.