Update git submodules

* Update docs/submodules/releng from branch 'master'
  - macros, docs, releng: Use `sudo -H` pip install

    This is still far from a clean and secure approach, as `pip install`
    should not be ran with `sudo`.
    However, `-H` limits the area we touch and also fixes some incompat
    between disto-provided pip and pip-provided pip.

    Change-Id: I0e19dfeaf66f6f453e3868c71016305ae050f0c8
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 7a33a35..2b90093 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 7a33a35410cb0daf1ab730e894ef827823dfed35
+Subproject commit 2b9009385839d6dc33beabd4eb833b179d4693f4