Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 75adc908843e3336ab70176c4ca360a116bdd137
  - Precise tag regex

    Change-Id: Ic1201c58bf9c85e2c5148da7d29b56e5fcbf7420
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index abc271b..75adc90 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit abc271b823967f776a67f8132cdb8d07c8fbb567
+Subproject commit 75adc908843e3336ab70176c4ca360a116bdd137