ipaclient: implement thin client

Dynamically create plugin package for the remote server with modules and
commands based on the API schema when client API is finalizes. For in-tree
API instances, use ipalib.plugins directly.

https://fedorahosted.org/freeipa/ticket/4739

Reviewed-By: David Kupka <dkupka@redhat.com>

ipaclient/remote_plugins/__init__.py

@@ -0,0 +1,14 @@
+#
+# Copyright (C) 2016  FreeIPA Contributors see COPYING for license
+#
+
+from . import schema
+
+
+def get_package(api):
+    if api.env.in_tree:
+        from ipalib import plugins
+    else:
+        plugins = schema.get_package(api)
+
+    return plugins