Add couchApp cron support

[khurtado]

Fixes #12000

Status

In development | not-tested

Description

Modifies cron method, so that it appends couchApp related cron lines accordingly.

Is it backward compatible (if not, which system it affects?)

NO It requires a backport in order to deploy WMAgent via docker (CMSKubernete)

Related PRs

https://github.com/dmwm/CMSKubernetes/pull/1534

External dependencies / deployment changes

<Does it require deployment changes? Does it rely on third-party libraries?>