The daily quota is not fullly respected if close to limit.

[lfield]

@davidpanderson I have been using the result of PR #3024 and each day when n_jobs_today is reset to 0, the host will receive more than 1 job even though max_jobs_per_day = 1. This results in n_jobs_today > max_jobs_per_day. From looking at the code, it seems that the check n_jobs_today < max_jobs_per_day is done quite early on but when it comes to actually selecting the tasks to send, this limit is not considered. Either the selection of tasks should include a check so that it stops when the limit is reached or the number of tasks to be selected is changed based on comparison with the limit.