Description of problem:

Credentials filtering is missing 'Created by' filter

Version-Release number of selected component (if applicable):

6.2.0-24

How reproducible:

100

Steps to Reproduce:
1. Open list of credentials
2. Click on 'Filter by'
3. Observe list of available criteria.

Actual results:

Filtering is available only by name and type

Expected results:

Filtering should be available by name, by type and by creator 

Additional info: