Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "Adapt to change in functest"
  - Adapt to change in functest

    Functest requires to read the variable TEST_DB_URL from the env. variables:

    https://gerrit.opnfv.org/gerrit/#/c/49757/

    Change-Id: Idbfc2df989f5b2a8e6ddd2d9a9a70526dd9bf1f4
    Signed-off-by: Manuel Buil <mbuil@suse.com>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 37082b6..1d77569 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 37082b6661e778b9faa9190f26df31538faa9680
+Subproject commit 1d775691155069aa730e671a285e6f25ce37cef1