Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 3f2c62e649c923e69d3b08dca5d4e7147a432803
  - Clean former pods in dovetail

    It must delete the yml file as there are no longer Dovetail pods
    or OPNFV installers to run against.

    It can be safely revert once a new setup allows verifying Dovetail.

    Change-Id: I766dd1a0619dd967d664d128224c3049e40609ce
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 7722459..3f2c62e 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 7722459d0afef7822b7b66131eb9cb064d47a1d8
+Subproject commit 3f2c62e649c923e69d3b08dca5d4e7147a432803