Add ogcli set mode command

This requests POST /modes and changes a scope mode by calling something like:
ogcli set modes --scope-id=1 --scope-type=computer --mode=pxe

cli/cli.py

@@ -58,3 +58,12 @@ class OgCLI():
 			OgModes.list_available_modes(self.rest)
 		elif args.item == 'scopes':
 			OgScope.list_scopes(self.rest)
+
+	def set(self, args):
+		choices = ['modes']
+		parser = argparse.ArgumentParser()
+		parser.add_argument('item', choices=choices)
+		parsed_args = parser.parse_args([args[0]])
+
+		if parsed_args.item == 'modes':
+			OgModes.set_modes(self.rest, args[1:])

cli/objects/modes.py

@@ -6,9 +6,33 @@
 # Free Software Foundation, version 3.
 #
 
+import argparse
+
 class OgModes():
 
 	@staticmethod
 	def list_available_modes(rest):
 		r = rest.get('/modes')
 		print(r.json())
+
+	@staticmethod
+	def set_modes(rest, args):
+		parser = argparse.ArgumentParser()
+		parser.add_argument('--scope-id',
+				    nargs=1,
+				    required=True,
+				    help='ID of the scope')
+		parser.add_argument('--scope-type',
+				    nargs=1,
+				    required=True,
+				    help='Type of the scope')
+		parser.add_argument('--mode',
+				    nargs=1,
+				    required=True,
+				    help='Mode for the scope')
+		parsed_args = parser.parse_args(args)
+
+		payload = {'scope': {'id': int(parsed_args.scope_id[0]),
+				     'type': parsed_args.scope_type[0]},
+			   'mode': parsed_args.mode[0]}
+		r = rest.post('/modes', payload=payload)