Update git submodules

* Update docs/submodules/releng from branch 'master'
  - xci: Networking fixes to introduce role and interface var

    Network configuration task and accompanied handler put into a role
    and handler is converted to task.

    Distro specific var, interface, is introduced to ensure we do not
    hardcode the interface which might not be available.

    Update the templates accordingly.

    Change-Id: I667620fe22c93a9b20a1d8c1b7b0051d7647b591
    Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d5dfeab..e7491c8 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d5dfeab7f851e407d6bb72ad0329897d4668fff2
+Subproject commit e7491c89ac3a78ccf4d682e0741dd51c4817b6a5