pool-manager configuration options will leak db passwd

[stanzgy]

when using powerdns with mysql as pool target, [pool_target:%id].options will contains db access information and this will be directly writed to logs without sanitization.

e.g.:
2015-05-12 15:14:53.044 27671 DEBUG designate.openstack.common.service [req-468ce0c2-84f5-47b2-ba85-d6a091651b6d - - - - -] pool_target:170dd95c-e282-11e4-b67e-56a46e28b239.options = {'connection': 'mysql://***:***@***:3306/***charset=utf8'} log_opt_values /usr/lib/python2.7/dist-packages/oslo_config/cfg.py:2195

IMO for security considerations, we should set this configuration option as secret.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/182214

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/182214
Committed: https://git.openstack.org/cgit/openstack/designate/commit/?id=3305c7745516e4161f722bf3744c1175aaea7fa9
Submitter: Jenkins
Branch: master

commit 3305c7745516e4161f722bf3744c1175aaea7fa9
Author: stanzgy <email address hidden>
Date: Tue May 12 17:46:19 2015 +0800

    Set cfg.pool_target.options as secret

    Change-Id: Ia6dfa4940568665aa1298a71845fe6b0a4c12e7d
    Closes-Bug: 1454175