Update git submodules

* Update docs/submodules/optf/osdf.git from branch 'master'
  to 7d4f37c45d50c56dfe438c04dbecea3ca9f7c9d2
  - Merge "Adding Arthur as a committer"
  - Adding Arthur as a committer
    
    Issue-ID: OPTFRA-682
    Change-Id: Icfe748a5c8d1f9fcef7268822224fdd3bbc9cb1d
    Signed-off-by: Shankar Narayanan <snarayanan@research.att.com>
    
diff --git a/docs/submodules/optf/osdf.git b/docs/submodules/optf/osdf.git
index 3620422..7d4f37c 160000
--- a/docs/submodules/optf/osdf.git
+++ b/docs/submodules/optf/osdf.git
@@ -1 +1 @@
-Subproject commit 3620422a425ee2df035c18d96a972230d1e12da7
+Subproject commit 7d4f37c45d50c56dfe438c04dbecea3ca9f7c9d2