Update git submodules

* Update docs/submodules/releng from branch 'master'
  to fe01e2d8ea9d3578cbeed5fd2b7ec50950c04b0a
  - Fix slave label usage

    Change-Id: Ic6e9d781c61d0c74a7c479728bd8093c950aa35b
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index fce79a6..fe01e2d 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit fce79a6297e14207d139fc6fabe948a3678310e3
+Subproject commit fe01e2d8ea9d3578cbeed5fd2b7ec50950c04b0a