account for tor 0.4.0.x's revised bootstrap status reporting
Tor 0.4.0.x includes changes to bootstrap status reporting (see #27167 (moved)). Tor Launcher should be updated to account for the changes; documentation is here: https://gitweb.torproject.org/torspec.git/commit/?id=27267c579fa943996688a5bbe933c0f8fc7a7ebc