Update git submodules

* Update docs/submodules/aaf/authz.git from branch 'master'
  to df9bf07b55ab41d9d69df04cd41e5bc4c9095893
  - stage a release candidate for 2.1.20
    
    Issue-ID: AAF-1124
    Signed-off-by: John J. Franey <john.franey@att.com>
    Change-Id: Ic4eb1e777946c9a009759684eb807287634c8050
    
1 file changed