Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 7bb73ecf40fbe81c0dd9532a61dc4baa8a63cd2f
  - Install curl because some tests install kind before running XtestingCI

    Change-Id: I3208e4715709d33363366f92fe048af8d7f948ab
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 71b4580..7bb73ec 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 71b458099cd3fd8f3660543fe32aff6c039d9e68
+Subproject commit 7bb73ecf40fbe81c0dd9532a61dc4baa8a63cd2f