Update git submodules

Update git submodules

* Update docs/submodules/compass4nfv from branch 'master'
  - Merge "Add real time kvm feature from kvmfornfv project"
  - Add real time kvm feature from kvmfornfv project

    JIRA: COMPASS-549

    1. Add rt_kvm plugin and os-nosdn-kvm-ha scenario in vm_enviroment
    2. Add rt_kvm in compass4nfv playbook
    3. Disable kernel update in KVM scenarios

    Signed-off-by: davidjchou <david.j.chou@intel.com>
    Change-Id: Ie164fe7ea28ebcb1e41299e92dc51b8ec16310eb
    Signed-off-by: chigang <chigang@huawei.com>