Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "playbooks: configure-opnfvhost: Be explicit when copying user files"
  - playbooks: configure-opnfvhost: Be explicit when copying user files

    The flavors may contain deployment specific user_variables.yml files
    so we should only copy the generic one in the common tasks and leave
    the rest for scenarios to copy them if necessary.

    Change-Id: I39e3e090dc40d4f13bb42028a24e8574e19cf6dd
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 9145384..b8791a5 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 91453843869e5092dc62a10c5644c2336a70fa2d
+Subproject commit b8791a548b1845691068830679b5fa8855def6e5