Clarify status subscription/request interval behaviour

[emiltin]

Say that a subscription has been set up for S0201. Every 5 minutes., starting from 15:00
Now, a get request is issued to S0201 at 15:02. What data should this get-request return?
Should it return the counts from 15:00 to 15:02 and contain a starttime=15:00? What then happens to the subscription that has been set up? Should it still return the data from 15:00 to 15:05? Or should it be reset to return from 15:02 to 15:05?

From rsmp-nordic/rsmp_validator#454