Update git submodules

* Update cookbook-openstack-compute from branch 'master'
  - Updates for Train
    
    The major change in this release is that the placement-api code base has been
    removed from nova and put into it's own project called placement [1]. Users who
    are coming from Stein will need to follow the upgrade guide [2] to properly
    upgrade to the new service.
    
    All attributes related to placement-api have been moved into their own files
    including configuration file attributes for placement.conf.
    
    Added:
    - Template to manage /etc/placement/placement.conf
    - Include openstack-compute::_nova_cell recipe to nova-setup so that the db
      migrations happen properly
    
    Changed:
    - Update release to train
    - Migrated from nova-placement-api to placement-api [1]
    
    Fixed:
    - Cookstyle & ChefSpec
    - Ordering of db syncs which was causing issues for Train
    - Set default['openstack']['compute']['syslog']['use'] to false by default
    - Various comments
    
    Removed:
    - Removed references to nova-consoleauth which has been removed upstream [3]
    - Removed references to xvpvnc which was removed upstream
    - Unused .rubocop.yml and .rubocop_todo.yml
    
    [1] https://docs.openstack.org/releasenotes/placement/train.html
    [2] https://docs.openstack.org/placement/latest/admin/upgrade-to-stein.html
    [3] https://docs.openstack.org/releasenotes/nova/train.html#prelude
    
    Change-Id: I996bcd2f63a080e10fadf0c7adf9a0ddcb0b5c7a
    Depends-On: https://review.opendev.org/731859
    Depends-On: https://review.opendev.org/731860
    Depends-On: https://review.opendev.org/731861

cookbook-openstack-compute

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-Subproject commit 50be0465fe9a65533b3abd4f09c294a8fc3ef819
+Subproject commit 6c69ce58b1a34e189cceefc1ad24d81637c58f39