Update git submodules

* Update docs/submodules/vnfrqts/usecases.git from branch 'master'
  to 59ff2477199487b67e75d016f288f0d81186e10a
  - VNFRQTS - Update version
    
    Issue-ID: VNFRQTS-653
    
    Signed-off-by: Hagop Bozawglanian <hagop.bozawglanian@att.com>
    Change-Id: Ic94ac6c300190ebe6d9c6e1079e3838dec4b4b0d
    
1 file changed