Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge RegexMatch into test_cli_env.py

    It also deletes SubstrMatch which is not called (then uncovered).

    Change-Id: Ifde1e2491ab5e0e75652eb4b25b359e859c2aa95
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index f45b641..4577924 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit f45b6411560bdc21b78346889a0e051cac48efb5
+Subproject commit 4577924d883f56c4fe13a60d1d8533b798375aad