Clean up vpp jenkins scripts & docker dir

Clean up vpp jenkins scripts & docker dir

- Remove docker/vpp Dockerfile definitions and
  colateral files for image now being build by
  https://gerrit.fd.io/r/c/ci-management/+/28022
- Remove opensuse support which has been elided
  from the vpp build in
  https://gerrit.fd.io/r/c/vpp/+/28999
- Remove unused scripts.
- Output script name marker for all jjb scripts
  following LFIT practices.
- Remove old/unused output from scripts.
- Add logic to use vpp-ext-deps download cache
  in the executor images to speed up build jobs.
- Add copyright notifcations to modified files
  without an existing copyright.
- Make all vpp/docs jobs use '-{stream}-{os}-{executor}'
  suffix in their names.
- Consolidate executor logging into
  setup_executor_env.sh and call it first for all jobs.

Change-Id: I4ffb67ed476659f0127ca8c84f20a305d06149bf
Signed-off-by: Dave Wallace <dwallacelf@gmail.com>