Add handler for /host=xxx/server=yyy/interface=zzz tries to install a runtime service

The /host=xxx/server=yyy/interface=zzz resource is a configuration-only resource inside the Host Controller, but when the add handlers for it run, they are attempting to install runtime services. The runtime services should only be installed in the server process.

This leads to boot failures if different server configs declare an interface with the same name (which would be the norm if an server-level interface config is declared at all):

[Host Controller] 13:55:33,400 ERROR [org.jboss.as.controller.management-operation] (Controller Boot Thread) JBAS014612: Operation ("add") failed - address: ([
[Host Controller] ("host" => "master"),
[Host Controller] ("server-config" => "server-two"),
[Host Controller] ("interface" => "public")
[Host Controller] ]): org.jboss.msc.service.DuplicateServiceException: Service jboss.network.public is already registered
[Host Controller] at org.jboss.msc.service.ServiceRegistrationImpl.setInstance(ServiceRegistrationImpl.java:154) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
[Host Controller] at org.jboss.msc.service.ServiceControllerImpl.startInstallation(ServiceControllerImpl.java:227) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
[Host Controller] at org.jboss.msc.service.ServiceContainerImpl.install(ServiceContainerImpl.java:560) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
[Host Controller] at org.jboss.msc.service.ServiceTargetImpl.install(ServiceTargetImpl.java:201) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
[Host Controller] at org.jboss.msc.service.ServiceControllerImpl$ChildServiceTarget.install(ServiceControllerImpl.java:2228) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
[Host Controller] at org.jboss.msc.service.ServiceBuilderImpl.install(ServiceBuilderImpl.java:307) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
[Host Controller] at org.jboss.as.controller.OperationContextImpl$ContextServiceBuilder.install(OperationContextImpl.java:955) [jboss-as-controller-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
[Host Controller] at org.jboss.as.server.services.net.SpecifiedInterfaceAddHandler.performRuntime(SpecifiedInterfaceAddHandler.java:56)
[Host Controller] at org.jboss.as.controller.operations.common.InterfaceAddHandler.performRuntime(InterfaceAddHandler.java:110) [jboss-as-controller-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]