fix unalias usage

cccli/command.py

@@ -140,8 +140,8 @@ class Command(object):
             raise BadArgument("%s: No such alias"%argv[1])
         del self.cli.alias[argv[1]]
         self.cli.alias.save()
-    cmd_alias.usage = "unalias [name]"
-    cmd_alias.desc = "Remove an aliases"
+    cmd_unalias.usage = "unalias [name]"
+    cmd_unalias.desc = "Remove an aliases"
 
     def cmd_rcmd(self, argv):
         '''Show remote commands'''