Update git submodules

* Update docs/submodules/releng from branch 'master'
  - [doctor] clean pep8 job

    The global 'lint-all-code' job is already enabled for doctor repo,
    so there is no need to keep this verify job which only run pep8.

    JIRA: DOCTOR-120

    Change-Id: I6eb95590b97c3bd2c2daa80a6ae3bcfe4a4119a4
    Signed-off-by: Ryota MIBU <r-mibu@cq.jp.nec.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 7128b24..76c14a8 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 7128b24eea7014889f86280b8c8f1d4253dfa2cc
+Subproject commit 76c14a82e6dfb1c0b86076a4dc5030e07a0bfe66