Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - xci: xci-deploy.sh: Extend regexp when collecting env variables

    Not all variables start with XCI, OPNFV or OPENSTACK so extend the
    regexp to look for more variables.

    Change-Id: If3693d65eec697f6c81c608da3be5799333c28d7
    Signed-off-by: Markos Chandras <mchandras@suse.de>
  - xci: scripts: start-new-vm.sh: Do not break on idle SSH connections

    Add ServerAliveInterval and ServerAliveCountMax directives in order
    to try and keep SSH connections alive. This aims to solve ssh timeouts
    like the following one on busy hypervisors:

    packet_write_wait: Connection to UNKNOWN port 0: Broken pipe

    Change-Id: I58029b41226098d6a44181434ad8653f72384e9d
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 4afd617..00972f7 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 4afd6172bd42b5dd279d54e863d77e412654435b
+Subproject commit 00972f7af0385b1072782dc14205abf6a00734a7