Update git submodules

* Update docs/submodules/vnfrqts/usecases.git from branch 'master'
  to c1c7626b7e453d4e10a3fd58350a4b742ce480bf
  - Add Trevor Lovett as committer
    
    Issue-ID: VNFRQTS-790
    Signed-off-by: Lovett, Trevor <trevor.lovett@att.com>
    Change-Id: I802c2e9be141d4092886997d6ea4e450195fced5
    
1 file changed