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)
    

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