sdp_upgrade.sh ignores a narrow subset of preflight checks.
The preflight/DRY RUN mode reports errors so they can be resolved
prior to an actual upgrade. However, all preflight errors should
prevent an attempted upgrade.
This bug resulted in an erroneous message indicating "All
preflight checks were successful." if certain preflight checks
failed. This job is a 'B' is those preflight checks ignored
are considered unlikely to occur.