MCOP-519 pin to version 0.28.x of rubocop
MCOP-519 pin to version 0.28.x of rubocop

The rubocop project releases farily frequently adding new style
rules, so pin to an agreed upon version to avoid sudden rework when
a new version of rubocop ships.

We need to adopt a recurring task to upgrade and evaluate new rubocop
rules, this commit should not be taken as following the dangerous
precedent of pinning and never updating a depedency.

johnduarte/marionette-collective,spandeyindia/marionette-collective-1,richardc/marionette-collective,richardc/marionette-collective,shrug/marionette-collective,shrug/marionette-collective,puppetlabs/marionette-collective,puppetlabs/marionette-collective,Iristyle/marionette-collective,geoffnichols/marionette-collective,kbarber/marionette-collective,kbarber/marionette-collective,richardc/marionette-collective,geoffnichols/marionette-collective,heathseals/marionette-collective,MikaelSmith/marionette-collective,pimpajr/marionette-collective,richardc/marionette-collective,geoffnichols/marionette-collective,richardc/marionette-collective,heathseals/marionette-collective,puppetlabs/marionette-collective,jessereynolds/marionette-collective,pimpajr/marionette-collective,MikaelSmith/marionette-collective,puppetlabs/marionette-collective,heathseals/marionette-collective,MikaelSmith/marionette-collective,heathseals/marionette-collective,heathseals/marionette-collective,spandeyindia/marionette-collective-1,johnduarte/marionette-collective,Iristyle/marionette-collective,geoffnichols/marionette-collective,Iristyle/marionette-collective,spandeyindia/marionette-collective-1,puppetlabs/marionette-collective,johnduarte/marionette-collective,kbarber/marionette-collective,kbarber/marionette-collective,johnduarte/marionette-collective,jessereynolds/marionette-collective,shrug/marionette-collective,jessereynolds/marionette-collective,spandeyindia/marionette-collective-1,kbarber/marionette-collective,MikaelSmith/marionette-collective,Iristyle/marionette-collective,jessereynolds/marionette-collective,johnduarte/marionette-collective,shrug/marionette-collective,shrug/marionette-collective,jessereynolds/marionette-collective,MikaelSmith/marionette-collective,geoffnichols/marionette-collective,shrug/marionette-collective,pimpajr/marionette-collective,heathseals/marionette-collective,johnduarte/marionette-collective,Iristyle/marionette-collective,kbarber/marionette-collective,jessereynolds/marionette-collective,richardc/marionette-collective,spandeyindia/marionette-collective-1,spandeyindia/marionette-collective-1,pimpajr/marionette-collective,pimpajr/marionette-collective,MikaelSmith/marionette-collective,Iristyle/marionette-collective,pimpajr/marionette-collective,puppetlabs/marionette-collective