Update git submodules

* Update docs/submodules/releng from branch 'master'
  to fc48c863d6dc5eae21a2f8b5906f5c135f5864bd
  - Fix incorrect url

    Change-Id: I2e61d00a5ff580573f1b234e3d652d9ee8f5d284
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d142955..fc48c86 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d1429558cd0959485115af5fc0ad09ea4fff7203
+Subproject commit fc48c863d6dc5eae21a2f8b5906f5c135f5864bd