Update git submodules

Update git submodules

* Update docs/submodules/appc/deployment.git from branch 'master'
  to 9c96d16bb3d9b96467efc931684d351b64eb871a
  - Issue-ID: APPC-1882 optimization in git clone using --depth

    optimize the git clone using --depth flag in term of size of clone
    and also in term's of time taken to fetch the files and commit history
    of whole repository .

    Respective issue with Issue-ID: APPC-1882  is created at

    https://jira.onap.org/browse/APPC-1882

    More detail can be found at blog
    https://www.atlassian.com/git/tutorials/big-repositories

    Signed-off-by: Pratik Raj <rajpratik71@gmail.com>
    Change-Id: Ic5e7169b23662f80f98e192355163159f42182b8