Description

Add missing supported OSes from the test matrix (Fixes: #194).
Move all suites expect those that don't run as root back to dokken, as running as non-root fails in dokken.
Add missing suites from the kitchen config to the matrix.
Remove post_converge from the dokken config, as it's gone from the vagrant config.
Ensure same platforms are listed in the dokken and vagrant kitchen configs.
Sync up the suite names in ci workflow and suites (change _ to -).
Correct test failure for server-runas-splunk where command failed due to permission error writing to /root/.splunk/.

Issues Resolved

That tests are carried out on more supported OSes (expect centos-6, as it's EoL on 2020-11-30).