Description of problem:
-----------------------
Quickstart Cloud Installer BZ 1352929 (https://bugzilla.redhat.com/show_bug.cgi?id=1352929) is blocked by inability to remove plaintext passwords from DynFlow Web UI.

Code has been written, but needs to be brought into a future downstream release. 

foreman-tasks PR 192 (https://github.com/theforeman/foreman-tasks/pull/192) dynflow PR 190 (https://github.com/Dynflow/dynflow/pull/190)


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


How reproducible:
-----------------
100%


Steps to Reproduce:
-------------------
1. Perform DynFlow task with sensitive data as part of the input params
2. Allow task to fail, so that input parameters are included in output


Actual results:
---------------
When task fails, output on Web UI includes sensitive params in plaintext


Expected results:
-----------------
API is provided to allow for filtering of sensitive data from the WebUI.
When task fails, output on Web UI obscures designated sensitive params.


Additional info:
----------------