Update git submodules

Update git submodules

* Update docs/submodules/compass4nfv from branch 'master'
  - Merge "fix ceph reboot issue"
  - fix ceph reboot issue

    When storage nodes reboot or shutdown,
    the partitions of loop device will lose.
    We add the command partprobe -s {{loopdevice}} to rc.local,
    it will reload the partitions, when boot up the storage nodes.

    Change-Id: I31dfca953aa254fa516421a494318b01cd39675c
    Signed-off-by: wutianwei <wutianwei1@huawei.com>