@Override
        public String toString() {
            return root.toString();
        }
Populate a writable disk path to be usable as a single plugin location.
The returned path will be usable as a single path.
@param path A non-existent path immediately within a writable directory, suggesting a location for this plugin.
@param type The format to which the on-disk plugin should conform
@param plugin The plugin which should be written to the specified path
@return The final usable path name to this location, in case it is different from the suggested input path.
tools/src/test/java/org/apache/kafka/tools/ConnectPluginPathTest.java