code: @Then("^I add a new DCOS label with key '(.+?)' and value '(.+?)' to the service '(.+?)'?$")
      public void sendAppendRequest(String key, String value, String service) throws Exception {
          commonspec.runCommandAndGetResult("touch " + service + ".json && dcos marathon app show " + service + " > /dcos/" + service + ".json");
          commonspec.runCommandAndGetResult("cat /dcos/" + service + ".json");
  
          String configFile = commonspec.getRemoteSSHConnection().getResult();
          String myValue = commonspec.getJSONPathString(configFile, ".labels", "0");
          String myJson = commonspec.updateMarathonJson(commonspec.removeJSONPathElement(configFile, "$.labels"));
  
          String newValue = myValue.replaceFirst("\\{", "{\"" + key + "\": \"" + value + "\", ");
          newValue = "\"labels\":" + newValue;
          String myFinalJson = myJson.replaceFirst("\\{", "{" + newValue.replace("\\n", "\\\\n") + ",");
          if (myFinalJson.contains("uris")) {
              String test = myFinalJson.replaceAll("\"uris\"", "\"none\"");
              commonspec.runCommandAndGetResult("echo '" + test + "' > /dcos/final" + service + ".json");
          } else {
              commonspec.runCommandAndGetResult("echo '" + myFinalJson + "' > /dcos/final" + service + ".json");
          }
          commonspec.runCommandAndGetResult("dcos marathon app update " + service + " < /dcos/final" + service + ".json");
  
          commonspec.setCommandExitStatus(commonspec.getRemoteSSHConnection().getExitStatus());
      }
docs: A PUT request over the body value.
  
  @param key
  @param value
  @param service
  @throws Exception