Update git submodules

* Update docs/submodules/daisy from branch 'master'
  - Merge "Mount xfs image with -o nouuid"
  - Mount xfs image with -o nouuid

    In [1], an error occured:
    "XFS (dm-6): Filesystem has duplicate UUID ... - can't mount".

    [1]: https://build.opnfv.org/ci/job/daisy-deploy-zte-pod9-daily-master/11/console

    Change-Id: I84052f481662e370ef8d41d62d356ad9a5e6e3c2
    Signed-off-by: Alex Yang <yangyang1@zte.com.cn>

diff --git a/docs/submodules/daisy b/docs/submodules/daisy
index 758c219..15772db 160000 (submodule)
--- a/docs/submodules/daisy
+++ b/docs/submodules/daisy
@@ -1 +1 @@
-Subproject commit 758c219ff3c371dd2e1c07ca7cd0e4c62d9f4c87
+Subproject commit 15772db47091b35d612f5d50bcf4584330b966ac