Title: Enable Security for the REST Endpoint

Describe the issue: The prerequisites no longer appear to be needed, standalone.xml and clustered.xml are already configured with and appropriate security-domain and auth-method. In fact the standalone-rest-auth.xml file is not in the docs/examples/configs directory anymore.


Suggestions for improvement:Remove the prerequisite steps.


Additional information: The procedure steps appear to be correct (unverified, other than a visual examination of the relevant application-*.properties files.
HOWEVER the sample xml code shown in step 1
<subsystem xmlns="urn:jboss:domain:datagrid:1.0">
  <rest-connector virtual-server="default-host"
                   cache-container="local"
                   security-domain="other"
                   auth-method="BASIC"/>
</subsystem>
Needs to be updated per this bug -
https://bugzilla.redhat.com/show_bug.cgi?id=1014895