Update git submodules

* Update docs/submodules/daisy from branch 'master'
  - Compatible with the no mapping in network.yml

    1)resolve the error  ' AttributeError: 'NetworkConfig' object has
    no attribute 'ext_mapping'' with the no mapping in network.yml.

    2)resolve the creating external subnet failure if the external
    netwok exists.

    Change-Id: I578365d91b8b61f9f88a5d4ff2c9db9ecc512edc
    Signed-off-by: zhongjun <zhong.jun@zte.com.cn>

diff --git a/docs/submodules/daisy b/docs/submodules/daisy
index 568edb9..027ecc6 160000 (submodule)
--- a/docs/submodules/daisy
+++ b/docs/submodules/daisy
@@ -1 +1 @@
-Subproject commit 568edb9d5ed462672d5a5c53ac735e04d8f687c4
+Subproject commit 027ecc6d1dbfd5a4dece51bded00fc0aa75d4b8b