Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Adding Doctor opnfv-7.0.1 tag"
  - Adding Doctor opnfv-7.0.1 tag

    Change-Id: Iaf0ff80c5716aa2051c04b0241a2d19d1709f0f1
    Signed-off-by: Tomi Juvonen <tomi.juvonen@nokia.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 1e2b2f8..3e20463 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 1e2b2f8fe3eed4c2fd1a9fbd61dfcd71ea39cbc3
+Subproject commit 3e20463ce41c2478c1c9234287e5b5bbefb8d5ed