Update git submodules

* Update docs/submodules/escalator from branch 'master'
  - Merge "support all cluster update option"
  - support all cluster update option

    Change-Id: I0ff8951d9106535ed8ee0b1fbdba345c52a00dc8
    Signed-off-by: liguomin <li.guomin2@zte.com.cn>

diff --git a/docs/submodules/escalator b/docs/submodules/escalator
index 6a4f961..d896ae4 160000 (submodule)
--- a/docs/submodules/escalator
+++ b/docs/submodules/escalator
@@ -1 +1 @@
-Subproject commit 6a4f961b61dfdb41d77dcec262bcda64f44689dd
+Subproject commit d896ae4dc8b96acd1b720c29817b6b7faf7f086a