Update git submodules

* Update docs/submodules/sdnvpn from branch 'stable/danube'
  - Remove quagga fix in the testcase

    Solves partly:
    JIRA: SDNVPN-130

    Change-Id: I1cf99e9294925545f6fece660983e32f6543f2b8
    Signed-off-by: Nikolas Hermanns <nikolas.hermanns@ericsson.com>
    (cherry picked from commit 5960fab7230bebbffc439457d5542d086cb3f8af)

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index ae2c308..9101d99 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit ae2c3083656f94ba5c763af8312098f0c85d9fae
+Subproject commit 9101d99bbf08e40a76651ca0e56c01ba3581f344