ofconfig: add commit and discard_changes operation support

They are necessary for switches that don't support the feature of
modifying 'running' configuration directly; instead, needs to modify
'candidate' configuration and then commit (or discard).

Also fix do_get method's comment typo.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Reviewed-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>

ryu/cmd/of_config_cli.py

@@ -142,7 +142,7 @@ class Cmd(cmd.Cmd):
 
     def do_get(self, line):
         """get <peer>
-        eg. get_config sw1
+        eg. get sw1
         """
 
         def f(p, args):
@@ -150,6 +150,26 @@ class Cmd(cmd.Cmd):
 
         self._request(line, f)
 
+    def do_commit(self, line):
+        """commit <peer>
+        eg. commit sw1
+        """
+
+        def f(p, args):
+            print p.commit()
+
+        self._request(line, f)
+
+    def do_discard(self, line):
+        """discard <peer>
+        eg. discard sw1
+        """
+
+        def f(p, args):
+            print p.discard_changes()
+
+        self._request(line, f)
+
     def do_get_config(self, line):
         """get_config <peer> <source>
         eg. get_config sw1 startup

ryu/lib/of_config/capable_switch.py

@@ -123,5 +123,11 @@ class OFCapableSwitch(object):
     def copy_config(self, source, target):
         self.netconf.copy_config(source, target)
 
+    def commit(self):
+        self.netconf.commit()
+
+    def discard_changes(self):
+        self.netconf.discard_changes()
+
     # TODO: more netconf operations
     # TODO: convinience(higher level) methods