Update git submodules

* Update docs/submodules/daisy from branch 'master'
  - Merge "Generate .ssh/known_hosts when making VM image"
  - Generate .ssh/known_hosts when making VM image

    Change-Id: I3f72239d6c4db27f67d5586c45e46ed01fad281d
    Signed-off-by: Alex Yang <yangyang1@zte.com.cn>

diff --git a/docs/submodules/daisy b/docs/submodules/daisy
index 26df202..3e7c69c 160000 (submodule)
--- a/docs/submodules/daisy
+++ b/docs/submodules/daisy
@@ -1 +1 @@
-Subproject commit 26df202d264c46e13ccbf0ab9502e7b48c73d1cf
+Subproject commit 3e7c69cce5778fbe371b88ec50086997ca6290ff