test: move sequential/test-debug-port-from-cmdline

Move sequential/test-debug-port-from-cmdline to test/parallel.  Per the
previous commit, it should now be possible to run the test in parallel
with other debugger tests.

PR-URL: https://github.com/iojs/io.js/pull/501
Reviewed-By: Bert Belder <bertbelder@gmail.com>
Reviewed-By: Rod Vagg <rod@vagg.org>

diff --git a/test/sequential/test-debug-port-from-cmdline.js b/test/parallel/test-debug-port-from-cmdline.js
similarity index 100%
rename from test/sequential/test-debug-port-from-cmdline.js
rename to test/parallel/test-debug-port-from-cmdline.js