Connection `close` leaks connections

[CuriousGeorgiy]

When closeing a connection, we do not erase it from the m_ReadyToSend and m_ReadyToDecode sets:

tntcxx/src/Client/Connector.hpp

Lines 184 to 190 in 8e009e8

	template<class BUFFER, class NetProvider>
	void
	Connector<BUFFER, NetProvider>::close(ConnectionImpl<BUFFER, NetProvider> &conn)
	{
	assert(!conn.strm.has_status(SS_DEAD));
	m_NetProvider.close(conn.strm);
	}

This causes all connections that have pending requests to be leaked.