cli custom_info restructure

now we have prettier custom_info commands

```$ katello ... system custom_info [add|update|remove] ...```
Fixing delayed_job breakages due to upgrade
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