Make failures to connect via Socks5() more informative and less unnecessarily scary.
Make failures to connect via Socks5() more informative and less unnecessarily scary.

* The "ERROR" was printed far too often during normal operation for what was not an error.
* Makes the Socks5() connect failure similar to the IP connect failure in debug.log.

Before:
`2016-05-09 00:15:00 ERROR: Proxy error: host unreachable`

After:
`2016-05-09 00:15:00 Socks5() connect to t6xj6wilh4ytvcs7.onion:18333 failed: host unreachable"`

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