shill: vpn: Enable openvpn logging with VPN scoped logging.

BUG=chromium-os:29566
TEST=unit tests

Change-Id: I28ab9a3ff1260ac14ef04fb9cf53a5418fd7f9bb
Reviewed-on: https://gerrit.chromium.org/gerrit/21035
Commit-Ready: Darin Petkov <petkov@chromium.org>
Reviewed-by: Darin Petkov <petkov@chromium.org>
Tested-by: Darin Petkov <petkov@chromium.org>
diff --git a/openvpn_driver.h b/openvpn_driver.h
index cf07d79..e73fabd 100644
--- a/openvpn_driver.h
+++ b/openvpn_driver.h
@@ -76,6 +76,7 @@
   FRIEND_TEST(OpenVPNDriverTest, ConnectTunnelFailure);
   FRIEND_TEST(OpenVPNDriverTest, Disconnect);
   FRIEND_TEST(OpenVPNDriverTest, GetRouteOptionEntry);
+  FRIEND_TEST(OpenVPNDriverTest, InitLoggingOptions);
   FRIEND_TEST(OpenVPNDriverTest, InitManagementChannelOptions);
   FRIEND_TEST(OpenVPNDriverTest, InitNSSOptions);
   FRIEND_TEST(OpenVPNDriverTest, InitOptions);
@@ -123,6 +124,7 @@
   void InitPKCS11Options(std::vector<std::string> *options);
   bool InitManagementChannelOptions(
       std::vector<std::string> *options, Error *error);
+  void InitLoggingOptions(std::vector<std::string> *options);
 
   bool SpawnOpenVPN();