Update git submodules

* Update docs/submodules/doctor from branch 'master'
  - Merge "fix some bugs for python verify jobs:"
  - fix some bugs for python verify jobs:

    1.PYTHON_ENABLE=True does not work in bash
    The python jobs does not run even we enabled them. The reason is that currently
    JJB parse the parameter 'PYTHON_ENABLE' as 'True' which does not work in bash.
    Fix it to compare with [Tt]rue.

    2.Install tox if it is not installed

    3.support only python3.4 in tox.ini

    4.install python3-dev

    Change-Id: I1a8ebad2fd06fe50ca4f739adb8d6d76caa2963b
    Signed-off-by: dongwenjuan <dong.wenjuan@zte.com.cn>

diff --git a/docs/submodules/doctor b/docs/submodules/doctor
index 6b11712..3e0300e 160000 (submodule)
--- a/docs/submodules/doctor
+++ b/docs/submodules/doctor
@@ -1 +1 @@
-Subproject commit 6b117129e778b4877b17cf594aec57fb029cb83d
+Subproject commit 3e0300e8f9695348aa4564f87a23ac3c0cf737ff