Store the OptionParser in the API, use it to print unified help messages

Make `ipa -h` and `ipa help` output the same message.

Since `ipa -h` output is generated by the OptionParser, we need to make
the parser available. Store it in `api.parser`.

Part of the effort for https://fedorahosted.org/freeipa/ticket/3060

ipalib/cli.py

@@ -759,7 +759,7 @@ class help(frontend.Local):
         name = from_cli(key)
         mod_name = '%s.%s' % (self._PLUGIN_BASE_MODULE, name)
         if key is None:
-            make_ipa_parser().print_help(outfile)
+            self.api.parser.print_help(outfile)
             return
         if name == "topics":
             self.print_topics(outfile)
@@ -771,7 +771,7 @@ class help(frontend.Local):
             if cmd.NO_CLI:
                 raise HelpError(topic=name)
             writer(_('Purpose: %s') % unicode(_(cmd.doc)).strip())
-            self.Backend.cli.build_parser(cmd).print_help()
+            self.Backend.cli.build_parser(cmd).print_help(outfile)
         elif mod_name in sys.modules:
             self.print_commands(name, outfile)
         elif name == "commands":
@@ -795,10 +795,6 @@ class help(frontend.Local):
 
         writer(_('Usage: ipa [global-options] COMMAND [command-options]...'))
         writer()
-        writer(_('Built-in commands:'))
-        for c in self._builtins:
-            writer('  %s  %s' % (to_cli(c.name).ljust(self._mtl), c.summary))
-        writer()
         writer(_('Help topics:'))
         for t in topics:
             topic = self._topics[t]
@@ -1029,8 +1025,9 @@ class cli(backend.Executioner):
         On incorrect invocation, prints out a help message and returns None
         """
         if len(argv) == 0:
+            self.Command.help(outfile=sys.stderr)
+            print >>sys.stderr
             print >>sys.stderr, 'Error: Command not specified'
-            self.Command.help()
             exit(2)
         (key, argv) = (argv[0], argv[1:])
         name = from_cli(key)

ipalib/plugable.py

@@ -593,6 +593,7 @@ class API(DictProxy):
         if context is not None:
             overrides['context'] = context
         self.bootstrap(**overrides)
+        object.__setattr__(self, 'parser', parser)
         return (options, args)
 
     def load_plugins(self):