Scrub those logs

[akwizgran]

This branch prevents some sensitive info from being logged:

• Local port numbers are scrubbed
• Logs that use java.util.logging (specifically onionwrapper) are directed through Logback so we can scrub them too
• Onion hostname (and path, when #103 is merged) are not logged as a consequence of logging the Sharing state
• HTTP request logs are only enabled for debug builds

Also, a second commit removes some code for the unused :tor service process.

Fixes #105.