Follow-up to jenkinsci/jenkinsfile-runner#252 . Currently Jenkinsfile Runner downloads plugins via HTTP in order to get plugins from mirrors. It would be great to change defaults to HTTPs.

I would expect that runtime plugin downloads are not actively used, but it still worth fixing it.

CC @LinuxSuRen

Issue: not enough documentation for arguments to pass into cfnCreateChangeSet

I'm trying to create a wrapper around the cfnCreateChangeSet but have had to spend quite a bit of time experimenting with options of "What-ifs" on whether I need to validate input parameters or if this will do all of the work for me.

Biggest problem I've found is the absence of documentation on the differe