Update git submodules

* Update docs/submodules/sdnvpn from branch 'stable/danube'
  - Fix testcase3 (peering subcase) for Apex

     - Fix runnning bgp related commands on Karaf:
       update util.run_odl_cmd() in order to be able to
       run commands on karaf client. Otherwise karaf
       commands fail
     - Ensure zrpcd/bgpd to run on controller side properly:
       Add missing quagga run folder, change owner and
       add user quagga into quaggavt group, in case of apex
       installer
     - Update the way of handling br-ex information and
       parsing out the controller external ip and mask:
       In case we have multiple ip/netmask assigned on br-ex
       the separation was faulty and an extra line, containing
       the second ip address, was added into ext_net_mask variable

    JIRA: SDNVPN-118

    Change-Id: I62468c94fd945ba30e419bd30d9cd85502f28eeb
    Signed-off-by: tomsou <soth@intracom-telecom.com>
    (cherry picked from commit db1ce6276c443dd9766458c516cc58c7f2e098d5)

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 4d2cf21..ae2c308 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 4d2cf21519e2c88866e4b5aac0b95eb5ed67f125
+Subproject commit ae2c3083656f94ba5c763af8312098f0c85d9fae