Update git submodules

Update git submodules

* Update docs/submodules/samplevnf from branch 'stable/euphrates'
  - common code: KW fixes for common code

    This patch fixes KW issues seen with the common code.

    Change-Id: I4f90369152345ea2ea9316b04ac946c0c69fd7d1
    Signed-off-by: Vishwesh M Rudramuni <vishwesh.m.rudramuni@intel.com>
  - VNFs: Fixing klocwork issue in VNFs code

    JIRA: SAMPLEVNF-83

    This patch fixes the klocwork reported issues

    Change-Id: I190d024777be1bf53cdc97feca1e5934781f3582
    Signed-off-by: Anand B Jyoti <anand.b.jyoti@intel.com>