Update git submodules

* Update docs/submodules/integration.git from branch 'master'
  to 7f9d6626bfef38c13fe6bdddd7dbbd84890fecc7
  - update the integration doc for vCPE
    
    Issue-ID: VFC-1668
    Change-Id: Id66215e9b12a5aa5ac8d99ab734bd51c0bb3b1fc
    Signed-off-by: zhaoliping123 <zhaoliping@chinamobile.com>
    
1 file changed