Update git submodules

* Update docs/submodules/externalapi/nbi.git from branch 'master'
  to 540ea00963f4bf7ad01819b9263a425db68e628e
  - Add _static files for docs
    
    .gitignore was preventing these files from being
    added. Update to not ignore the files and re-add
    them in docs folder
    
    Issue-ID: CIMAN-33
    Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
    Change-Id: Ic32d3526f32b6feb1adf7f1a1e5f90df36659a40
    
1 file changed