add set-controller command for ovs-vsctl and SetSSLParam for ovs-ofctl

ovs-ofctl can use controller address to communicate with ovs daemon. it
uses ip:port and it does not require sudo. SetSSLParam is used to pass
the keys and certs required to make a SSL connection..

Author: mregmi

ovs/client.go

@@ -308,6 +308,14 @@ func Protocols(versions []string) OptionFunc {
 	}
 }
 
+// SetSSLParam allows additional arbitary parameters to be appended in the end
+func SetSSLParam(pkey string, cert string, cacert string) OptionFunc {
+	return func(c *Client) {
+		c.ofctlFlags = append(c.ofctlFlags, fmt.Sprintf("--private-key=%s", pkey),
+			fmt.Sprintf("--certificate=%s", cert), fmt.Sprintf("--ca-cert=%s", cacert))
+	}
+}
+
 // Sudo specifies that "sudo" should be prefixed to all OVS commands.
 func Sudo() OptionFunc {
 	return func(c *Client) {

ovs/vswitch.go

@@ -119,6 +119,13 @@ func (v *VSwitchService) SetFailMode(bridge string, mode FailMode) error {
 	return err
 }
 
+// SetController sets the controller for this bridge so that ovs-ofctl
+// can use this address to communicate.
+func (v *VSwitchService) SetController(bridge string, address string) error {
+	_, err := v.exec("set-controller", bridge, address)
+	return err
+}
+
 // exec executes an ExecFunc using 'ovs-vsctl'.
 func (v *VSwitchService) exec(args ...string) ([]byte, error) {
 	return v.c.exec("ovs-vsctl", args...)