Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Update Parser Fraser 6.0.1 Release Tag"
  - Update Parser Fraser 6.0.1 Release Tag

    opnfv-6.0.0 was previously tagged on the master branch, but the ref to
    be release is on stable/fraser. So bumping the tag to 6.0.1 and adding
    the previous tag at the correct ref to the file.

    Change-Id: Ic57fd2116e8662391748455cfe25c23e9853b65d
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 75572f3..ec76b17 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 75572f361d0c85737f3269a7b066bc1ee4f576f1
+Subproject commit ec76b175b72f5f0021cb5299e98e05bc7a798362