Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Remove opnfv/functest-restapi"
  - Remove opnfv/functest-restapi

    It also stops building opnfv/functest-x:euphrates.

    Change-Id: I562a1edaae00c608167374664b694976efd72a1a
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 12648c2..1700372 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 12648c2b266f532571781ea80d044eabdc9ba538
+Subproject commit 1700372dd68d072fbd77cb3b739a4cf5c9e6aec4