Bug 1426082 - Enable test_transport.py. r=whimboo

MozReview-Commit-ID: LIhRX6uoJFh

--HG--
extra : rebase_source : 0761a0df5f30bf2de5ba05f6b8b5e3574099845d

testing/marionette/harness/marionette_harness/tests/unit/unit-tests.ini

@@ -1,4 +1,5 @@
 [test_marionette.py]
+[test_transport.py]
 [test_cli_arguments.py]
 skip-if = manage_instance == false || appname == 'fennec' # Bug 1298921
 [test_geckoinstance.py]