Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Remove copper refs"
  - Remove copper refs

    Copper withdrew from E release (see comments in [1]).

    [1] https://gerrit.opnfv.org/gerrit/#/c/38851/

    Change-Id: I1af463f5d60a6099592c1005ce27d3ca0c40cbbf
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index d49350d..469abc9 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit d49350df590caaa3db45c9a201618248d3f92b92
+Subproject commit 469abc969a94e3e3c6f4967b6d1fd8953a56e497