Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - remove unwated proxy in the script

    Change-Id: I4a38ac4f7a05b6a96fd9e0e8539aa76252ded3b0
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index 39e8650..754ab8a 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit 39e86509bc8459440f951aa0a6d5dff17a979d76
+Subproject commit 754ab8a76a4b7a5e248f5d61be459539922ff238