Fix a bug when cluster mode and limited rate are used at the same time #264
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In cluster mode, a client can open several connections. If one of them handles a response before the connection of another,
m_reqs_processed
is positive at line 556 so the timed event is not created. Since the bufferevent is already enabled, the process would hang forever. This might fix #94, might not. This is a quick fix. There are definitely better ways to repair it.