Fix mask_dict_password for non string/dict type key in dict

[dharmendra]

mask_dict_password method remove the keys from passed dict if those
are not of
- indicative of password
- Dict
- String type

So key with value None of other type than string/dict are being removed.

This method should just change the password with secret and retur other
Key as it is without any removal or alter.

Ex.
>>> dk_dict = {'password': 'd81juxmEW_', 'user': 'admin', 'dkdk': None, 'home-dir': '/home/admin', 'kk': None}

>>> strutils.mask_dict_password(dlk, '***')
{'password': '***', 'user': u'admin', 'home-dir': u'/home/admin'}

[dharmendra (dharmendra-kushwaha)]

https://review.openstack.org/#/c/339450/

[Doug Hellmann (doug-hellmann)]

This issue was fixed in the openstack/oslo.utils 3.16.0 release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/oslo.utils 3.16.0 release.