DC Manager add command

[Brent Rowsell]

The dcmanager add command needs to be updated for the following parameters to accept a URL in addition to a local file path.

  --bootstrap-values BOOTSTRAP_VALUES
                        YAML file containing subcloud configuration settings.
  --deploy-playbook DEPLOY_PLAYBOOK
                        An optional ansible playbook to be run after the
                        subcloud has been successfully bootstrapped. It will
                        be run with the subcloud as the target and
                        authentication is handled automatically.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/689868

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/689868
Committed: https://git.openstack.org/cgit/starlingx/distcloud-client/commit/?id=b7f7848ec01103361e9238bcf264b4a68043c1c1
Submitter: Zuul
Branch: master

commit b7f7848ec01103361e9238bcf264b4a68043c1c1
Author: Angie Wang <email address hidden>
Date: Mon Oct 21 15:10:06 2019 -0400

    Update subcloud add command arguments to accept a URL

    This commit updates the argument --bootstrap-values and
    --deploy-playbooks for the command subcloud add to accept
    a URL in addition to a local file path.

    Tested:
     - arguments with URL and local path
     - exceptions

    Change-Id: I5f2128ce35284499f1b3cecd9f1535111a08d775
    Closes-Bug: 1848539
    Signed-off-by: Angie Wang <email address hidden>