Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "xci: Destroy/undefine only the VMs we created"
  - xci: Destroy/undefine only the VMs we created

    Destroying/undefining all the VMs on host might cause issues for the
    users. This change tries to reduce the possibility of it by removing
    VMs listed by vbmc.

    Change-Id: I5134043309722632df68a0800c6403e6f39a8d16
    Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 9951290..04f931b 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 9951290d0a2fe9c8d60ce5d95abcd3b8b7dabb32
+Subproject commit 04f931b3ee3f3226426e384cc379aeb32f5064d0