Update git submodules

* Update docs/submodules/sdnvpn from branch 'stable/gambia'
  - Add suport for fuel installer

    JIRA: SDNVPN-238
    JIRA: FUEL-393

    This patch adds support for fuel installer by modifying relevant
    pieces of code.

    Change-Id: I5245e84022dd258c96648b0985660e093ca98b52
    Signed-off-by: Stamatis Katsaounis <mokats@intracom-telecom.com>
    (cherry picked from commit b17b3d80849b9c9989fb4deeb6001a6ff78261c1)

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 945c46b..07de5b7 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 945c46bc9daca2c354de89534e81e85425d78cd7
+Subproject commit 07de5b7295d72bf0db2872494c91295b677b9238