cellshell: admin interface commands (method -> class conversion)

Motivation

To convert the admin commands from methods to classes by implementing the @command annotation, which provide helpful description and hint.

Modification

These following commands were modified:
1. getroutes command
2. getcellinfo command
3. getcellinfos command
4. getcontex command

Result

Helpful description of the command with usage explanation of the arguments and options

Acked-by: Paul Millar
Target: trunk
Require-book: no
Require-notes: no

modules/cells/src/main/java/dmg/cells/nucleus/CellShell.java

@@ -368,9 +368,6 @@ private String commandLine( String c ) throws CommandExitException {
    //
    //   getroutes, getcelltunnelinfos, getcellinfos
    //
-   public Object ac_getroutes( Args args ){
-       return _nucleus.getRoutingList() ;
-   }
     @Command(name = "getroutes", hint = "list all routes",
             description = "List all message routes available in " +
                     "this domain. The returned information " +