Update the Integrity-plugin to match the "Generic SCM step" interface requirements.

This would include

• various methods in SCM which formerly took an AbstractBuild now take a more generic Run (i.e., potentially a workflow build) plus a FilePath (i.e., a workspace).
• use the specified workspace rather than the former build.getWorkspace()
• some methods formerly taking AbstractProject now take the more generic Job.
• use @Override wherever possible to make sure you are using the right overloads.
• Replace AbstractBuild.getProject with Run.getParent.
• BuildListener has to be replaced with TaskListener in new method overloads.
• Note that changelogFile may now be null in checkout. If so, just skip changelog generation.
• checkout now takes an SCMRevisionState so you can know what to compare against without referring back to the build.
• replace getBuiltOn with FilePath.getComputer.
• SCMDescriptor.isApplicable should be switched to the Job overload.
  ....

see details here:
https://github.com/jenkinsci/workflow-plugin/blob/master/scm-step/README.md

This would generally include the use case of a "random checkout", which means that there is a single run that only want's to fetch a project content, defined only for this very job (e.g. a config path to a build project); no changelog or history required.