migrate beam_it_args -> beam_it_options

[kennknowles]

When adding the mvn -> pkb -> mvn integration for the IO IT's usage of PKB, I noticed that beam_it_args had two problems:

1. args had a format for passing options that was sub-optimal
2. the thing we are working with is options, not args, so it's mis-named.

It was important to solve #1, but you can't just change the name since it'd break with the currently checked in jenkins job. So I needed to migrate away from it, and #2 presented an easy opportunity to do so, so I added beam_it_options as the new option.

We should remove usages of beam_it_args and migrate over to only beam_it_options, then remove beam_it_args from pkb

Imported from Jira BEAM-2650. Original Jira may contain additional context.
Reported by: sisk.