Fixed Data race condition in Network Reachability #50
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establishConnection()in RetryMechanism.swift internally checks for networkAvailability with Reachability which updates network status flags and triggers notifications in async.observerNetworkConnectivity()adds observers for reachable and not-reachable state.This sequence of events leads to race-condition for
whenReachableandwhenUnreachableobservers as those are being set and get at the same time from different threads.This MR changes sequence of events. With these changes, we add the observers first and then check for network status and try to establishConnection.