Change CD time caculate way.

[linushuan]

Now CD time is 30s per time.
We want change it to maybe 5 quota initial (also max), and submit once will minus 1, 30s can add 1.

[tobiichi3227]

I’m assigning this issue to you.
The URL below is our current implementation of the CD time submission.
https://github.com/TFcis/NTOJ/blob/v2.0/src/handlers/submit.py#L181-L196