Document additional steps required after running elytron-tool.sh

Chapter 14.4 Creating Users documents how to convert property-based user storage to file-based user storage with the elytron-tool.sh script.

After running the script, an additional step is required to rename the "roles" attribute in the created *.xml files to "role". This can either be done manually, or using a command line script:

1. Open each kie-fs-realm-users/*/<USER>.xml file
2. Replace

<attribute name="roles" value=

with

<attribute name="role" value=

Alternatively, run a script similar to the following to apply this change to all <USER>.xml files:

$ find standalone/configuration/kie-fs-realm-users/ -name '*.xml'|xargs sed -i 's/roles/role/'

In addition, in the same Chapter, we are showing how to create new users using the $ ./bin/jboss-cli.sh --commands="embed-server ... command. In this command, all single quotes (') should be removed, otherwise the generated <USER>.xml file is incorrect.