Update git submodules

* Update docs/submodules/releng from branch 'master'
  - xci: Merge bifrost provisioning scripts and rename

    Jobs are adjusted as well.

    Change-Id: I0bc5bdda37277053d81d7da394e0156902da817a
    Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 8b15725..0150873 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 8b15725dc3a5df11bb3f62b054ee5454f4506ba4
+Subproject commit 01508737693731742269326d6ae92a17bebea433