Update git submodules

* Update docs/submodules/daisy from branch 'master'
  - add separated disk for ceph in multi-nodes virtual deploy

    Change-Id: Ic3f67bb889c20e95916a1052f0cfa1e238f133a8
    Signed-off-by: Alex Yang <yangyang1@zte.com.cn>

diff --git a/docs/submodules/daisy b/docs/submodules/daisy
index cbdb2b6..bfacd10 160000 (submodule)
--- a/docs/submodules/daisy
+++ b/docs/submodules/daisy
@@ -1 +1 @@
-Subproject commit cbdb2b6ab819f1cad4cfcdc47c53d76030305633
+Subproject commit bfacd100e576a50be19447f7c1b6cea2ac55ebd0