Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - REST_API: rest api client implementation

    JIRA: SAMPLEVNF-78

    This patch implements rest api's for VNF clients. This
    comprises of
            * vnf api's for common functionality
            * vnf api's for CGNAPT
            * vnf api's for VFW

    Change-Id: I56d22c64bf3ee5b0a2e536da8169ac7583499041
    Signed-off-by: Vishwesh M Rudramuni <vishwesh.m.rudramuni@intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index d451d3d..98b9571 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit d451d3d2e6423523c300488f33adb4e593d6d2cb
+Subproject commit 98b9571f6720a0da06b1d430e7338a0734023232