cli custom_info restructure

now we have prettier custom_info commands

```$ katello ... system custom_info [add|update|remove] ...```
Delayed Jobs - Fixes an issue with the update to delayed jobs 3.0
where to_yaml was being called on the target of AsyncOperation and
not the AsyncOperation itself.
Merge pull request #1880 from komidore64/ci_restructure

cli custom_info restructure
adding ruby193 scl devel deps
Merge pull request #1888 from daviddavis/fix_delayed_job_breakage

Fixing breakages due to delayed_job version change
Merge pull request #1890 from jlsherrill/comps-update

adding ruby193 scl devel deps
Merge pull request #1889 from ehelms/delayed_jobs_fix

Delayed Jobs - Fixes an issue with the update to delayed jobs 3.0
System groups: allow users to update systems via CLI