Improve uorb subscription interval handling #648
Merged
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This fixes an issue found with "topic_listener -r 1" command;
The topic which is subscribed with a rate of 1 second is initially given twice, and after that every 1 second.
The time when the topic was last updated can't be initialized to 0. The best possible initial value is "now - interval", which gives the subscriber the first publish after subscription, and after that according to the interval.