Review new "options" and audit project scripts

[phillipjohnston]

https://jenkins.io/blog/2018/04/09/whats-in-declarative/

New options

The options directive in Declarative can contain a number of different kinds of configuration: traditional Jenkins job properties, like buildDiscarder, wrapper steps to execute the entire Pipeline within, like timeout, and Declarative-specific options that can switch from some default behaviors of Declarative execution. We’ve added two new Declarative-specific options in the last few releases.

• checkoutToSubdirectory - Allows you to override the location that the automatic SCM checkout will use. Using checkoutToSubdirectory("foo"), your Pipeline will checkout your repository to "$WORKSPACE/foo", rather than the default of "$WORKSPACE".
• newContainerPerStage - If you’re using a top-level docker or dockerfile agent, and want to ensure that each of your stages run in a fresh container of the same image, you can use this option. Any stage without its own agent specified will run in a new container using the image you’ve specified or built, on the same computer and with access to the same workspace.