Delete a security group.

    CLI example::

        salt myminion boto_secgroup.delete mysecgroup

def delete(name=None, group_id=None, region=None, key=None, keyid=None,
           profile=None, vpc_id=None, vpc_name=None):
    '''
    Delete a security group.

    CLI example::

        salt myminion boto_secgroup.delete mysecgroup
    '''
    conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)

    group = _get_group(conn, name=name, vpc_id=vpc_id, vpc_name=vpc_name,
                       group_id=group_id, region=region, key=key, keyid=keyid,
                       profile=profile)
    if group:
        deleted = conn.delete_security_group(group_id=group.id)
        if deleted:
            log.info('Deleted security group %s with id %s.', group.name, group.id)
            return True
        else:
            msg = 'Failed to delete security group {0}.'.format(name)
            log.error(msg)
            return False
    else:
        log.debug('Security group not found.')
        return False