Change plugin name from dispatch-plugin to dispatch-hawtio-console to match the artifact name

The maven build for the hawtio console creates a file named

• dispatch-hawtio-console-<version>-SNAPSHOT.war

Currently, that needs to be renamed to

• dispatch-plugin.war
  before it is copied to the webserver's webapps directory.

It would be better to have the plugin name of

• dispatch-hawtio-console.war