Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "jjb: xci: xci-verify-jobs: Use clean vm to verify XCI jobs"
  - jjb: xci: xci-verify-jobs: Use clean vm to verify XCI jobs

    Per Idec0fc06c82435adc1a4d569b8e578616998de5f it's now possible
    to use a clean virtual machine to verify XCI so lets make use of
    it. Moreover this patch updates the distro parameter to use more
    accurate names and bring it inline with what dib expects.

    Change-Id: I18c88637819884fef07d0bfa0dc2c1077a26c2f1
    Signed-off-by: Markos Chandras <mchandras@suse.de>
    Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 97ae2ba..77b9e3e 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 97ae2baff7af396ff2a90e7838fe0c50ef2dfce8
+Subproject commit 77b9e3e5787e39fd44a9dcfb73e128e02a32d4e6