Fix some of the leaks exposed by extending the parse-launch testsuite, and move the 3 I can't figure out into a separ...

Original commit message from CVS:
* gst/parse/grammar.y:
* gst/parse/parse.l:
* tests/check/pipelines/parse-launch.c: (expected_fail_pipe),
(GST_START_TEST), (parse_suite):
Fix some of the leaks exposed by extending the parse-launch testsuite,
and move the 3 I can't figure out into a separate test that won't run
the pipelines unless the appropriate line is uncommented.