provider: integration tests (#1127)

* provider: adding provide and reprovide queue

* provider: network operations

* add some tests

* schedule prefix len computations

* provider schedule

* provider: handleProvide

* addressed review

* use go-test/random

* satisfy linter

* log errors during initial prefix len measurement

* address review

* satisfy linter

* address review

* provider: explore swarm

* provider: batch provide

* provider: batch reprovide

* provider: catchup pending work

* provider: options

* provide: handle reprovide

* provider: daemon

* provider: integration tests

* cancel context of external functions + tests

* fix panic when adding key to trie if superstring already exists

* address review

* decrease minimal region size from replicationFactor+1 to replicationFactor

* simplify unscheduleSubsumedPrefixesNoClock

* address review

* fix test to match region size (now: replicationFactor, before: replicationFactor+1)

* dequeue outside of go routine

* fix tests

* close connectivity

* fix waitgroup

Author: guillaumemichel

provider/provider.go

@@ -897,7 +897,7 @@ func (s *SweepingProvider) handleReprovide() {
 
 	s.wg.Add(1)
 	go func() {
-		if err := s.workerPool.Acquire(periodicWorker); err != nil {
+		if err := s.workerPool.Acquire(periodicWorker); err == nil {
 			s.batchReprovide(currentPrefix, true)
 			s.workerPool.Release(periodicWorker)
 		}
@@ -1319,7 +1319,6 @@ func (s *SweepingProvider) provideRegions(regions []keyspace.Region, addrInfo pe
 			continue
 		}
 		s.provideCounter.Add(s.ctx, int64(len(allKeys)))
-
 	}
 	// If at least 1 regions was provided, we don't consider it a failure.
 	return errCount < len(regions)