Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Remove Copper and refs to Copper"
  - Remove Copper and refs to Copper

    Issue-ID: COPPER-37, COPPER-38, COPPER-40

    Copper was terminated so removing build files and refs to the
    copper project. A ticket has been submitted to the OPNFV
    Helpdesk to make the Copper repo read-only.

    Change-Id: I9b9ec88abd5c2ade816fc588c5549af0c6b6ee13
    Signed-off-by: Aimee Ukasick <aimeeu.opensource@gmail.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 862d3b9..1d106b0 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 862d3b992eca9cb831abb8f971801cb1c8c7c13f
+Subproject commit 1d106b04c6294905b85c25bd4542b3aded638eb8