Update git submodules

* Update docs/submodules/releng from branch 'master'
  - remove fuel job in Doctor

    As Doctor has no fuel CI Pods avaiable now，remove the jobs which
    run in fuel Pods, these would be added again once the Pods are ready.

    Change-Id: Iadc32f68bb22809291fba2ab6ec729234711f525
    Signed-off-by: dongwenjuan <dong.wenjuan@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d1057ca..c47aaaa 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d1057cac11a73ec112824b0e93e3da35bf083685
+Subproject commit c47aaaa53c91aae93877f2532c72374beaa4eabe