${arquillian.wildfly.host:localhost}
My complete file was:
<container qualifier="jboss" default="true">
<!-- By default, Arquillian will use the JBOSS_HOME environment variable to find the JBoss EAP installation.
If you prefer not to define the JBOSS_HOME environment variable, alternatively you can uncomment the
following `jbossHome` property and replace EAP_HOME with the path to your JBoss EAP installation. -->
<configuration>
<property name="managementAddress">${arquillian.wildfly.host:localhost}</property>
<property name="jbossHome">/Users/jeremydavis/Workspace/summit/jboss-eap-7.1</property>
</configuration>
</container>