Update git submodules

Update git submodules

* Update docs/submodules/compass4nfv from branch 'stable/fraser'
  - Workaround for Tacker in HA scenarios

    JIRA: -

    For Tacker service in HA mode, it only generates VIM fernet key on
    one of the Tacker hosts. This may cause error when a request is
    been routed to another host. We need to use Barbican and Mistral
    components. But now OSA did not support Mistral yet. So we add
    a workaround here to get over this issue.

    Change-Id: I9aa228ec2ac7011cedb1eb503611ca24c7666caa
    Signed-off-by: Yifei Xue <xueyifei@huawei.com>
    (cherry picked from commit d7156c0b772ada65ff3d094bd70814bf5b0cb4e7)

  - Enable the neutron trunk

    Change-Id: Ieb5d505adc88644cfc1f802364064f5551a1ed53
    Signed-off-by: wutianwei <wutianwei1@huawei.com>
    (cherry picked from commit 01ff42530757cf99e99b0d63d6daa822b93e1941)

  - Fix pip version to 9.0.1

    JIRA: COMPASS-593

    OpenStack Ansible install latest pip on
    each contoller node and the latest pip
    (currently 10.0.0b1) doesn't support empty
    package list to be passed into it. Add a
    user config file to fix pip version.

    Change-Id: Ie193389c2b4995cdc4b81876f8cdcfc512cf5ea1
    Signed-off-by: Harry Huang <huangxiangyu5@huawei.com>
    (cherry picked from commit 18cf3eec4990e2e747cadc8b9c177e5b1d0c67f4)

  - Install PBR to ensure we're not breaking builds

    Change-Id: I4e7b47a8f2021a1cf25b80d7818f4dabb441c39f
    Signed-off-by: wutianwei <wutianwei1@huawei.com>
    (cherry picked from commit 4ce9351a4802a1bdaecdf1a0fe982e2878755c03)