Improve kola argument processing logic for platform specific options

[travier]

Feature Request

If a platform specific option is passed to kola, it should default to that platform. For example if --aws-ami but the platform is not set, kola should default to the aws platform.

Example from (now removed): https://github.com/coreos/coreos-assembler/blob/0a09bd74a376fb5bda9142d3da1ee10b7b34a2f3/mantle/cmd/kola/options.go#L180

[itsCheithanya]

Hi @travier I would love to contribute!

[travier]

Great! Feel free to give it a try and ask for help on Matrix.

[itsCheithanya]

Sorry @travier I'm new to this project what is Matrix, a channel like slack?

[travier]

See https://github.com/coreos/fedora-coreos-tracker#communication-channels-for-fedora-coreos