Update git submodules

* Update docs/submodules/vid.git from branch 'master'
  to 421fd2a498707d5844e9a99eed039ddcb8b52e06
  - Merge "Bump VID master version to 6.0.0 (Frankfurt)"
  - Bump VID master version to 6.0.0 (Frankfurt)
    
    Change-Id: I74b6f5dbf614cf3a29a8c1570a1f113d191f7e57
    Issue-ID: VID-631
    Signed-off-by: Ittay Stern <ittay.stern@att.com>
    
diff --git a/docs/submodules/vid.git b/docs/submodules/vid.git
index bc0dcab..421fd2a 160000
--- a/docs/submodules/vid.git
+++ b/docs/submodules/vid.git
@@ -1 +1 @@
-Subproject commit bc0dcab7a235ad78a6b3201aa315e2071eac8fce
+Subproject commit 421fd2a498707d5844e9a99eed039ddcb8b52e06