Update git submodules

* Update docs/submodules/doctor from branch 'master'
  - Merge "Add host specific VM list to inspector design guide line"
  - Add host specific VM list to inspector design guide line

    JIRA: DOCTOR-73
    Change-Id: I163b97ec87761538594034e926055646223af327
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>

diff --git a/docs/submodules/doctor b/docs/submodules/doctor
index dfb3c06..5ffd957 160000 (submodule)
--- a/docs/submodules/doctor
+++ b/docs/submodules/doctor
@@ -1 +1 @@
-Subproject commit dfb3c066a1c325ba7ca028be98d9ec04af994f48
+Subproject commit 5ffd957a87858e026011e4bbde9b493c62c11b8e