Align TC_MEC_SRV_RNIS_016_OK with related TP (fix #28)

Check RabInfo

    [Arguments]    ${received_value}

    log    ${received_value}

    Should Be Equal As Strings   ${received_value['appInstanceId']}    ${APP_INS_ID}

    Should Not Be Empty    ${received_value['requestId']}

    Run Keyword If    'cellUserInfo' in ${received_value}    Should Be Equal As Strings    ${received_value['cellUserInfo'][0]['ecgi']['cellId']}    ${CELL_ID}