Watchmaker

**Summary**:

* ash-linux-formula
- Replace `watch` with `listen` to restart the `sshd` service a single time
- Make state RHEL-07-040560 more resilient when the yum group info is missing
* scap-formula
- Updates SCAP content from DISA (as of February 2021) and OpenSCAP (v0.1.54)
* Update watchmaker default `config.yaml` to use salt v2019.2.8
* Ability to browse [Watchmaker Cloudarmor repo](https://watchmaker.cloudarmor.io/list.html)

**Summary**:

* nessus-agent-formula
- (Linux) Switch to using Salt service state to ensure Nessus agent service is running

**Summary**:

* watchmaker-salt-content
- (Linux) Updates scap-formula pillar to use alternative stig profile parameter for Red Hat

**Summary**:

* (Windows) Removes winrepo.genrepo usage in Salt worker since it's no longer required

**Summary**:

* splunkforwarder-formula
- (Linux) Patches splunkforwarder state to work with Splunk Universal Forwarder v7.3.6

**Summary**:

* Updates default watchmaker config.yaml to use salt 2019.2.5