Update git submodules

* Update docs/submodules/doctor from branch 'stable/euphrates'
  - fix the bug for consumer don't receive the notification

    There is no 'sudo' command in functest container, so the stunnel is setup failed.

    Change-Id: I9e317c0643a370fb5b35d90363b0ff734a77c040
    Signed-off-by: dongwenjuan <dong.wenjuan@zte.com.cn>
    (cherry picked from commit aa16cb3987bad7abfb8743cb205980a50d5f12fe)

diff --git a/docs/submodules/doctor b/docs/submodules/doctor
index 2c9569e..b42b9f7 160000 (submodule)
--- a/docs/submodules/doctor
+++ b/docs/submodules/doctor
@@ -1 +1 @@
-Subproject commit 2c9569e66c4f0e333d603f93b280768bea4f2d07
+Subproject commit b42b9f7eaeaf3246c934187268d9b9e20b263935