Counting known buckets on router at first time in this test was not
stable as sometimes discovery_fiber didn't have time to start discovery
process.
Let's start router with disabled discovery, make sure the router doesn't
know any buckets, enable discovery mode and wait until it gets all
buckets from replica.
Counting known buckets on router at first time in this test was not stable as sometimes discovery_fiber didn't have time to start discovery process.
Let's start router with disabled discovery, make sure the router doesn't know any buckets, enable discovery mode and wait until it gets all buckets from replica.
Closes #304