Update git submodules

* Update docs/submodules/doctor from branch 'master'
  - Merge "fix some bugs in monitor"
  - fix some bugs in monitor

    1.send bytes data to the socket
    see https://docs.python.org/3/library/socket.html
    2.fix a endless loop

    Change-Id: I880e713266347d8836cec45ebf9a500bb7c813f4
    Signed-off-by: dongwenjuan <dong.wenjuan@zte.com.cn>

diff --git a/docs/submodules/doctor b/docs/submodules/doctor
index 38c4512..d2b6574 160000 (submodule)
--- a/docs/submodules/doctor
+++ b/docs/submodules/doctor
@@ -1 +1 @@
-Subproject commit 38c45126cb9c993571246b307ff644b1343712c9
+Subproject commit d2b6574994e065de13c2d31f9a6d7f27142c0a41