Disable authentication for management interfaces in EAP 6

Issue

• Disabling authentication by removing the security-relam from http-interfaces throws the below exceptions

10:52:05,318 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-8) MSC000001: Failed to start service jboss.serverManagement.controller.management.http: org.jboss.msc.service.StartException in service jboss.serverManagement.controller.management.http: java.lang.NullPointerException
    at org.jboss.as.server.mgmt.HttpManagementService.start(HttpManagementService.java:220) [jboss-as-server-7.1.3.Final-redhat-4.jar:7.1.3.Final-redhat-4]
    at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811) [jboss-msc-1.0.2.GA-redhat-2.jar:1.0.2.GA-redhat-2]
    at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746) [jboss-msc-1.0.2.GA-redhat-2.jar:1.0.2.GA-redhat-2]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) [rt.jar:1.6.0_24]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) [rt.jar:1.6.0_24]
    at java.lang.Thread.run(Thread.java:679) [rt.jar:1.6.0_24]
Caused by: java.lang.NullPointerException
    at org.jboss.as.domain.http.server.ManagementHttpServer.create(ManagementHttpServer.java:157) [jboss-as-domain-http-interface-7.1.3.Final-redhat-4.jar:7.1.3.Final-redhat-4]
    at org.jboss.as.server.mgmt.HttpManagementService.start(HttpManagementService.java:184) [jboss-as-server-7.1.3.Final-redhat-4.jar:7.1.3.Final-redhat-4]
    ... 5 more

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10:52:10,510 INFO  [org.jboss.as.controller] (Controller Boot Thread) JBAS014774: Service status report
JBAS014777:   Services which failed to start:      service jboss.serverManagement.controller.management.http: org.jboss.msc.service.StartException in service jboss.serverManagement.controller.management.http: java.lang.NullPointerException