[#165] Add stream listing tests

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

api/data/listsession.go

@@ -2,17 +2,18 @@ package data
 
 import (
 	"context"
+	"sync/atomic"
 )
 
 type VersionsStream interface {
 	Next(ctx context.Context) (*NodeVersion, error)
 }
 
-// todo consider thread safe
 type ListSession struct {
 	Next     []*NodeVersion
 	Stream   VersionsStream
 	NamesMap map[string]struct{}
 	Context  context.Context
 	Cancel   context.CancelFunc
+	Acquired atomic.Bool
 }