display host:port if HOSTADDR is provided by Tor
Nick was kind enough to fix #15006 (moved), so now we should use the new info that Tor provides via the control port to display the host and port when reporting host-related errors that occur during bootstrapping. This will require a few changes to Tor Launcher's error reporting code.
It would be nice to fix this for TB 4.5 if other people approve. Kathy and I will make a patch available soon so it may be reviewed.
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