Update git submodules

* Update docs/submodules/sdc/sdc-docker-base.git from branch 'master'
  to 4d19876e687e3c6bec24e967c2812a46669de94e
  - Add Labels to Docker images

    Add vcs_ref and vcs_branch as labels in the maven docker build
    Added a profile to make this work both in local and with Gerrit

    Issue-ID: SDC-3113
    Signed-off-by: ChrisC <christophe.closset@intl.att.com>
    Change-Id: I341341fe7846b974e5275dcf150d5111c686f38c

diff --git a/docs/submodules/sdc/sdc-docker-base.git b/docs/submodules/sdc/sdc-docker-base.git
index e373c54..4d19876 160000 (submodule)
--- a/docs/submodules/sdc/sdc-docker-base.git
+++ b/docs/submodules/sdc/sdc-docker-base.git
@@ -1 +1 @@
-Subproject commit e373c54d113f93f3d3057506db65b4fd4b02c16e
+Subproject commit 4d19876e687e3c6bec24e967c2812a46669de94e