Update git submodules

* Update docs/submodules/integration.git from branch 'master'
  to 1b681e360b8d083104026080c5517f237dc0945a
  - Integration doc for 5g pnp pnf use case
    
    Issue-ID: INT-1333
    
    Signed-off-by: krzysztof kuzmicki <krzysztof.kuzmicki@nokia.com>
    Change-Id: Ic75ae09374ea806ea67526fba624c7a654c0aa10
    
1 file changed