add waitGroups for waiting finish all connects (#131)

closes #130

Reviewed-on: #131
Co-authored-by: Evstigneev Denis <danteevstigneev@yandex.ru>
Co-committed-by: Evstigneev Denis <danteevstigneev@yandex.ru>

go.sum

@@ -1,15 +1,20 @@
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