tests: fix wireproto redirection test on systems without tls1.2 Our automated package builder has some ancient configuration that lacks modern TLS, which is how we noticed this. Tested: the test now passes on both macOS High Sierra (has tls1.2) and Ubuntu Trusty (which does not).

phabricator: ensure the command summaries are available in extension help Previously, `hg help phabricator` listed the 3 supported commands at the bottom of the extension help, but said "no help text available".