Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 2d1656e1df9421811315cc23a54b7fe57f215c17
  - Fix typo in .boto path

    Change-Id: I273ac0939da7ed536889d389f7d57e47510a2b16
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index c6e4060..2d1656e 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit c6e40603d8e326753bb47ed04df496629fd88b56
+Subproject commit 2d1656e1df9421811315cc23a54b7fe57f215c17