Update git submodules

* Update docs/submodules/releng from branch 'master'
  to a5bc6dfa1db3a902189d8d71b3d7125e9cd3f046
  - Use fbot (jenkins-ci no longuer exists)

    Change-Id: I5b99dc6cd809eaad23f5b92a1650bf2775fd0d01
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index c8bcbab..a5bc6df 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit c8bcbab71b721fb658567de7ed64a0bef2e84321
+Subproject commit a5bc6dfa1db3a902189d8d71b3d7125e9cd3f046