Update git submodules

* Update docs/submodules/doctor from branch 'master'
  - Use py34 instead of py35

    Change-Id: I597723147a195f0f76210aeafd610fc79527de64
    Signed-off-by: Tomi Juvonen <tomi.juvonen@nokia.com>

diff --git a/docs/submodules/doctor b/docs/submodules/doctor
index 2a60d46..e70bf24 160000 (submodule)
--- a/docs/submodules/doctor
+++ b/docs/submodules/doctor
@@ -1 +1 @@
-Subproject commit 2a60d460eaf018951456451077b7118b60219b32
+Subproject commit e70bf248daac03eee6b449cd1654d2ee6265dd8c