Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "Do not execute ironic node-list"
  - Do not execute ironic node-list

    This command has been removed in order to solve the issue
    caused by executing the command outside of venv. Apart from
    that, it doesn't add much value to the process in general either.

    Change-Id: Ice7edc5adbd3dd2e2bbde57b8cebd92416825597
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 22c401e..175b154 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 22c401e5aed10e09b4849673f3a6bd0defbb504a
+Subproject commit 175b1544882572c442702f4db8f0ead73df1413d