fix: flaky TestFindPeerQueryMinimal

[guillaumemichel]

Fixes #791

• to make sure that all peers are found, set Resiliency to bucketSize
• if self (guy) is among the closest peers of the key that is looked up, the test may fail
  • in this case we don't look for the bucketSize closest peers, but for the bucketSize+1 closest peers, excluding self, hence the last peer may not be correct
• fix: if self is among the closest peers, add it to the list of returned peers when checking for the closest peers