Tor Process
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Helper functions for working with tor as a process.

NO_TORRC:
   when provided as a torrc_path tor is ran with a blank configuration

DEFAULT_INIT_TIMEOUT:
   number of seconds before we time out our attempt to start a tor
   instance

**Module Overview:**

   launch_tor             - starts up a tor process
   launch_tor_with_config - starts a tor process with a custom torrc
