VMware: add support for default pbm policy

[OpenStack Infra]

https://review.openstack.org/68131
commit 7ad0a79a4d9320e6821ca8ce061efcf1d1aa2319
Author: Gary Kotton <email address hidden>
Date: Wed Aug 20 16:17:01 2014 +0300

    VMware: add support for default pbm policy

    This is part of the blueprint vmware-spbm-support.
    If there is no defined storage policy in the flavor then the default
    storage policy will be used. This patch set adds in the definition of
    the default storage policy and validates it existence when the service
    starts.

    DocImpact
        - pbm_enabled - enables storage policy based placement
        - pbm_default_policy - the default policy that will be used if there
          is none in the flavor
        - pbm_wsdl_location (optional) - PBM service WSDL file location URL.
          e.g. file:///opt/SDK/spbm/wsdl/pbmService.wsdl.

    Co-authored-by: Radoslav Gerganov <email address hidden>

    Change-Id: I1fc5a99c153d815ea735dccda9d2958dba52ec49

[Tom Fifield (fifieldt)]

This was picked up by the recent autogenerate-config-doc run.