Update git submodules

* Update docs/submodules/daisy from branch 'master'
  - Merge "Use pxe bridge to replace the bridge in VM template"
  - Use pxe bridge to replace the bridge in VM template

    1. Eliminate hard code about pxe bridge
    2. Replace the bridge in daisy VM template with the pxe bridge
    provided by jenkins

    Change-Id: I7a8463181847417d10705ce9ff4db6e68d505c6d
    Signed-off-by: Alex Yang <yangyang1@zte.com.cn>

diff --git a/docs/submodules/daisy b/docs/submodules/daisy
index d6a3c35..fcbe542 160000 (submodule)
--- a/docs/submodules/daisy
+++ b/docs/submodules/daisy
@@ -1 +1 @@
-Subproject commit d6a3c3524894e40f2f1279fde8ff93cd1857e2b0
+Subproject commit fcbe5420d31bf04b1d8bdf47994c174795718e66