make triton volume feature hidden

lib/cli.js

@@ -205,12 +205,11 @@ function CLI() {
             'reboot',
             'ssh',
             'ip',
-            { group: 'Images, Packages, Networks, Firewall Rules, Volumes' },
+            { group: 'Images, Packages, Networks, Firewall Rules' },
             'image',
             'package',
             'network',
             'fwrule',
-            'volume',
             { group: 'Other Commands' },
             'info',
             'account',

lib/do_volume/index.js

@@ -48,4 +48,6 @@ VolumeCLI.prototype.do_delete = require('./do_delete');
 
 VolumeCLI.aliases = ['vol'];
 
+VolumeCLI.hidden = true;
+
 module.exports = VolumeCLI;