Update git submodules

* Update docs/submodules/daisy from branch 'master'
  - Merge "The image file is deleted mistakenly"
  - The image file is deleted mistakenly

    There's an mistake in patch 33327.
    See https://gerrit.opnfv.org/gerrit/#/c/33327/
    The cleanup function was called twice, so the image file was deleted.

    Change-Id: I5fe6a90b46739d1c6d8b66365d2c8e55350cde00
    Signed-off-by: Alex Yang <yangyang1@zte.com.cn>

diff --git a/docs/submodules/daisy b/docs/submodules/daisy
index e88f774..12eaf7b 160000 (submodule)
--- a/docs/submodules/daisy
+++ b/docs/submodules/daisy
@@ -1 +1 @@
-Subproject commit e88f7744d97fd940db2ffdda76ee1b12bc97a216
+Subproject commit 12eaf7b46bec6d25caf0d2d58c7a1eb69f33a3d8