Duplicating -Djboss.server.base.dir if defined in more than one place

If -Djboss.server.base.dir is set in more than one place the process is started with the duplicate property.

Is this expected behavior?

The duplicated -Djboss.server.base.dir can be easily reproduced with just our scripts.

    ./standalone.sh -Djboss.server.base.dir=/path/to/standalone

or by setting it in $JAVA_OPTS.
(the only difference is where the first one shows up - with JAVA_OPTS it's earlier in the command line).

standalone.sh is specifically looking for that property in $JAVA_OPTS or $SERVER_OPTS and then adding it on the command line (even if it was already there).

I created this as a minor issue because it's been like this for a long time and more than likely it's an edge case. The latter of the properties will be used by the JVM.