GUAC-672: Add "telnet" to list of known protocols. Associate terminal icon with telnet.

guacamole/src/main/java/org/glyptodon/guacamole/net/basic/crud/protocols/List.java

@@ -69,7 +69,7 @@ public class List extends AuthenticatingHttpServlet {
      * Array of all known protocol names.
      */
     private static final String[] KNOWN_PROTOCOLS = new String[]{
-        "vnc", "rdp", "ssh"};
+        "vnc", "rdp", "ssh", "telnet"};
 
     /**
      * Parses the given XML file, returning the parsed ProtocolInfo.