tor_bootstrap_progress should echo 0 if no matching log line is found
On a (one month old) feature/jessie build, I see:
19:48:39 amnesia nm-dispatcher: /etc/NetworkManager/dispatcher.d/20-time.sh: 204: [: Illegal number: 19:48:48.000 [notice] Bootstrapped 0%: Starting
tor_bootstrap_progress should return (really, echo) 0 if
grep | tail | sed pipeline returns nothing.
Feature Branch: bugfix/8257-more-robust-tor_bootstrap_progress
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