Update git submodules

* Update docs/submodules/doctor from branch 'master'
  - Removing temporary process group solution.
    Introducing root cause fix for sample inspector shutdown

    JIRA: DOCTOR-123

    Change-Id: Ibc95d482f476b60584c224d8e2757d071149d611
    Signed-off-by: Tomi Juvonen <tomi.juvonen@nokia.com>

diff --git a/docs/submodules/doctor b/docs/submodules/doctor
index 2889f8c..9779a91 160000 (submodule)
--- a/docs/submodules/doctor
+++ b/docs/submodules/doctor
@@ -1 +1 @@
-Subproject commit 2889f8cc9c54b53e2e39a268ff83474ce352239b
+Subproject commit 9779a91a2eb0ae7745552d30af1accbfe7a70ca0