Update git submodules

* Update docs/submodules/aaf/authz.git from branch 'master'
  to 6a12a6f42bdb2c1a13498f88000bada9b09c683f
  - push release 2.1.20 to nexus repository
    
    Issue-ID: AAF-1124
    Signed-off-by: John J. Franey <john.franey@att.com>
    Change-Id: I8c1dd0bf927461030ab6e7633280f262858f73d8
    
diff --git a/docs/submodules/aaf/authz.git b/docs/submodules/aaf/authz.git
index 6216814..6a12a6f 160000
--- a/docs/submodules/aaf/authz.git
+++ b/docs/submodules/aaf/authz.git
@@ -1 +1 @@
-Subproject commit 6216814d263834a61708ec1cf002365f4ad6f969
+Subproject commit 6a12a6f42bdb2c1a13498f88000bada9b09c683f