Description of problem:
 Installer removes the default content of mgmt-users.properties which, among other things, contains default realm name used by add-user utility.
  - $INSTALLATION_TARGET/standalone/configuration/mgmt-users.properties
  - $INSTALLATION_TARGET/domain/configuration/mgmt-users.properties

Version-Release number of selected component (if applicable):
 6.4.0.CR1

How reproducible:
 Always

Steps to Reproduce:
 1. java -jar jboss-eap-6.4.0.CR1-installer.jar
 2. finish installation using default values where possible
 3. vim $INSTALLATION_TARGET/standalone/configuration/mgmt-users.properties

Actual results:
$ cat EAP-6.4.0/standalone/configuration/mgmt-users.properties 
admin=6b9d4d6d0293f023f66c51d8b70392d8

It would be nice to preserve most of the content and remove just last paragraph, since there are some useful information.
Expected results:
$ cat jboss-eap-6.4/standalone/configuration/mgmt-users.properties 
#
# Properties declaration of users for the realm 'ManagementRealm' which is the default realm
# for new installations. Further authentication mechanism can be configured
# as part of the <management /> in standalone.xml.
#
# Users can be added to this properties file at any time, updates after the server has started
# will be automatically detected.
#
# By default the properties realm expects the entries to be in the format: -
# username=HEX( MD5( username ':' realm ':' password))
#
# A utility script is provided which can be executed from the bin folder to add the users: -
# - Linux
#  bin/add-user.sh
#
# - Windows
#  bin\add-user.bat
#
#$REALM_NAME=ManagementRealm$ This line is used by the add-user utility to identify the realm name already used in this file.
#
# On start-up the server will also automatically add a user $local - this user is specifically
# for local tools running against this AS installation.
#
admin=6b9d4d6d0293f023f66c51d8b70392d8

Additional info:
 Darran, can you please confirm that $REALM_NAME in these files is used only by add-user utility?