Update git submodules

* Update docs/submodules/integration.git from branch 'master'
  to 818f76a0173c5d6cef483425042b4f0651ee793b
  - EMS simulator extension for PNF SW Upgrade
    
    Change-Id: I3a8c706373f4004850c2403f4aee0d1f28aad464
    Issue-ID: INT-1208
    Signed-off-by: Enbo Wang <wangenbo@huawei.com>
    
1 file changed