Update git submodules

* Update docs/submodules/externalapi/nbi.git from branch 'master'
  to f4bcabffd0e4caae0f1f8834c0d9b5082c18837e
  - Update service catalog swagger as per suggested guidelines.
    
    Issue-ID: EXTAPI-374
    Signed-off-by: aosull01 <adrian.osullivan@huawei.com>
    Change-Id: I9633cf2dab7f312e67b022937f55da7f7b03071f
    
1 file changed