allow user to specify the appname and substitute the actual hostname into /etc/confconsole/services.txt

Simple change to:

- allow users the ability to create a file called /etc/appname that should contain the name of the appliance. The current behavior is that the appname is set to the hostname,. which may not always be appropriate
- allow users to substitute the hostname into /etc/confconsole/services.txt by using the $hostname keyword (similar to how $ipaddr works today)