Update git submodules

Update git submodules

* Update docs/submodules/integration.git from branch 'master'
  to b0accc3b42d9fa079d30ad6c5d32129e084a1ab9
  - Add reverse-SSHFS-based file synchronization from Operator's machine

    This patch also introduces (almost) empty directory to the repository as
    a mountpoint for the synchronized files. Additional flag ("nonempty") is
    passed upon mounting directory to ignore the sole file there
    ("operator/.gitignore").

    Issue-ID: ONAPARC-551
    Change-Id: I9187325a08cccb98b7335fcb320c2004ed26e7f3
    Signed-off-by: Pawel Wieczorek <p.wieczorek2@samsung.com>