servicemix-wsn2005 should be able to configure username/password when connect to a secure jms broker

as now FUSE ESB embeded amq broker by default has jaas plugin like

        <plugins>
            <jaasAuthenticationPlugin configuration="karaf" />
        </plugins>

when install servicemix-wsn2005 feature, we get authentication error as currently servicemix-wsn2005 can't specify username/password for the jms connection, we should add this configuration through ConfigAdmin service, so that users can add
org.apache.servicemix.components.wsn2005.cfg in $FUSE_ESB/etc, and configure username/password they want, the default one should be like

brokerUsername=admin
brokerPassword=admin