ci: add script to validate user is approved

This is the script run within the following jenkins job:
https://jenkins.openbmc.org/job/CI-MISC/job/openbmc-userid-validation/

Put it into a source controlled script so others can review and update
it.

Tested:
- Extracted this into the jenkins job and ran it. Verified it worked as
  expected.

Change-Id: I6deefcf6b443ea33b028ee25451e9377dabbfb22
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
1 file changed