Update git submodules

* Update docs/submodules/releng from branch 'master'
  - calipso: Tie jobs to centos machine

    Change-Id: I7c2d0afb4c2b3e2680893c8cea660b36c553b39c
    Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 1233f8b..2ce0eac 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 1233f8b2a7f2ad058ee49c8c074b3933237bef0b
+Subproject commit 2ce0eacae50991eef00ce7a0f8a021bc1980473b