Provide a job option that allows jobs found from polling to be added to the queue even when there is another job running.

Current Behavior:
Poll finds job and starts it.
If job is still running the next time a poll occurs no jobs are added to the queue and the following message is reported: _ "Build in progress, polling delayed."_

Desired Behavior:
Poll finds job and starts it.
If job is still running the next time a poll occurs a job is queued.

Current Workaround:

• Shorter polling periods so there is less delay after the previous job completes.
• Set 'Execute concurrent builds if necessary' and use Perforce change-submit triggers to trigger Perforce job.