syslogd: Create regression tests

[jfree]

Summary

syslogd: Create regression tests

These tests should tell you if your changes to syslogd have contributed
to a functional regression.

This specific commit adds testing for:
- basic start/stop
- configuration reloading
- program filters
- host filters
- property filters
- pipe actions

[jfree]

Fix spelling mistakes and update to-do list

[jfree]

Launch syslogd with the -d debug flag to provide more diagnostic information upon test failures.

[markj]

Do you have any updates to this patch? I think I will commit it first, since I'm still waiting for the stable/14 branch, but having extra tests poses no problems.

[jfree]

In D41403#947165, @markj wrote:

Do you have any updates to this patch? I think I will commit it first, since I'm still waiting for the stable/14 branch, but having extra tests poses no problems.

Unfortunately, no.