Add section on domain-specific info for CLI commands to CLI guide

Some EAP guides default to showing standalone versions of CLI commands and point to the CLI guide for using the CLI for a managed domain (for example here [1]).

It would be nice to add a small section to the CLI guide about the differences in CLI commands for standalone vs. domain mode and common ways to change a standalone command to be appropriate for a managed domain. For example, things like:

• Adding "/profile=PROFILE_NAME" in front of a "/subsystem=..." command
• Adding "/host=HOST_NAME" in front of core management commands, etc.
• Mentioning that some commands will require a host (--host), but they'll error with a message that it's required
• Some runtime commands will require /host=HOST_NAME/server=SERVER_NAME in front, like viewing logs

[1] https://access.qa.redhat.com/documentation/en-us/red_hat_jboss_enterprise_application_platform/7.1.Beta/html-single/how_to_set_up_sso_with_kerberos/#configure_the_legacy_security_subsystem