tap/awk: allow escaping of TAP directives * lib/tap-driver.sh (setup_result_obj): Handle escaping of TAP directives in a way tat is (mostly) compatible by what is done by the TAP::Parser module. With this change, the tests `tap-escape-directive.test' and `tap-escape-directive-2.test' now also pass with the shell/awk implementation of the TAP driver.