Update git submodules

* Update docs/submodules/doctor from branch 'master'
  - use password_plugin_loader for auth

    Change-Id: Ifb650f52fed641a7146358eada571e5c4beaf3d6
    Signed-off-by: dongwenjuan <dong.wenjuan@zte.com.cn>

diff --git a/docs/submodules/doctor b/docs/submodules/doctor
index d5918a8..f771070 160000 (submodule)
--- a/docs/submodules/doctor
+++ b/docs/submodules/doctor
@@ -1 +1 @@
-Subproject commit d5918a87f12fdef9bd7408c4554c42606c4896d8
+Subproject commit f77107087079caa9b1602be6308d98107c9639b8