Given VPC properties, find and return matching VPC ids.
    Borrowed from boto_vpc; these could be refactored into a common library

def _find_vpcs(vpc_id=None, vpc_name=None, cidr=None, tags=None,
               region=None, key=None, keyid=None, profile=None):
    '''
    Given VPC properties, find and return matching VPC ids.
    Borrowed from boto_vpc; these could be refactored into a common library
    '''
    if all((vpc_id, vpc_name)):
        raise SaltInvocationError('Only one of vpc_name or vpc_id may be '
                                  'provided.')

    if not any((vpc_id, vpc_name, tags, cidr)):
        raise SaltInvocationError('At least one of the following must be '
                                  'provided: vpc_id, vpc_name, cidr or tags.')

    local_get_conn = __utils__['boto.get_connection_func']('vpc')
    conn = local_get_conn(region=region, key=key, keyid=keyid, profile=profile)
    filter_parameters = {'filters': {}}

    if vpc_id:
        filter_parameters['vpc_ids'] = [vpc_id]

    if cidr:
        filter_parameters['filters']['cidr'] = cidr

    if vpc_name:
        filter_parameters['filters']['tag:Name'] = vpc_name

    if tags:
        for tag_name, tag_value in six.iteritems(tags):
            filter_parameters['filters']['tag:{0}'.format(tag_name)] = tag_value

    vpcs = conn.get_all_vpcs(**filter_parameters)
    log.debug('The filters criteria %s matched the following VPCs:%s',
              filter_parameters, vpcs)

    if vpcs:
        return [vpc.id for vpc in vpcs]
    else:
        return []