Update git submodules

* Update docs/submodules/daisy from branch 'master'
  - Merge "Hardcoded physnet1 changed to obtain from .yml"
  - Hardcoded physnet1 changed to obtain from .yml

    the physical network device of external network is hardcode to
    'physnet1',change it to obtain from network.yml configuration
    file.

    Change-Id: Id2e45ac488619db2247e73cc3fed5706db31d9e9
    Signed-off-by: zhongjun <zhong.jun@zte.com.cn>

diff --git a/docs/submodules/daisy b/docs/submodules/daisy
index 0f20344..568edb9 160000 (submodule)
--- a/docs/submodules/daisy
+++ b/docs/submodules/daisy
@@ -1 +1 @@
-Subproject commit 0f203447deda439811dd4062c588ef4145a34873
+Subproject commit 568edb9d5ed462672d5a5c53ac735e04d8f687c4