tor_bootstrap: fail test if we cannot connect to control port

Fail test rather than exiting with an error.
tor-config: remove duplication of main config
Add tools/update_doc

Small script to rebuild doc and sync it to people.tpo.
doc/new-test.txt: mention tor_bootstrap test type
Add an 'enable' option to test definitions

A reference to a perl subroutine that should return false when
the test should be skipped.
Add httpproxy tests

Tests using an http proxy, in addition to a bridge, and obfs3 or fte
pluggable transports.