Update git submodules

* Update docs/submodules/samplevnf from branch 'stable/euphrates'
  - gateway: Created common code for routing in gateway

    JIRA: SAMPLEVNF-58

    Adding the common code for routing functionality in gateway config.

    Change-Id: I2a2f085a3555db52c8aff87f1bab1b00d11481ea
    Signed-off-by: Anand B Jyoti <anand.b.jyoti@intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index a6c7342..a12bf49 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit a6c7342b5cf20691bd45e55587deabac8da3a671
+Subproject commit a12bf49777c66b03354d30b66be301167a86be94