@Override
    public String getHttpMethod() {
        return "POST";
    }
Adds the specified host to an existing cluster.

@param params - Ambari connection information.
@param clusterName - Existing cluster name.
@param hostName - New host name. Host must have been registered previously using RegisterHostWebRequest.
ambari-funtest/src/test/java/org/apache/ambari/funtest/server/api/host/AddHostWebRequest.java