Add shill Service properties for L2TP/IPSec XAUTH

Add new two properties for L2TP/IPSec VPN services that allow
XAUTH username and password parameters to be specified.

BUG=chromium:267647
TEST=Unit test; upcoming VPNConnect/l2tpipsec_xauth

Change-Id: Ic6de8c9292700347657d55dd9b4ee088ee24462c
Reviewed-on: https://chromium-review.googlesource.com/181075
Reviewed-by: Paul Stewart <pstew@chromium.org>
Tested-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Paul Stewart <pstew@chromium.org>
1 file changed
tree: f37d0ecc347ccc2ce09f3bef7d252bd6754fe3d4
  1. constants/
  2. dbus/
  3. switches/
  4. README
  5. system_api.gyp