Revert "lttng-tools: filter random filename of ptest output"

Revert "lttng-tools: filter random filename of ptest output"

This reverts commit 29a8c45be2862be02afe2ebbc5c026a42f351990.

A few things wrong with this change:

1. It patches a patch (runtest-2.4.0.patch).
2. It introduces deviations from the desired ptest output format.
3. It discards PASS: lines from the test output; I *want* to see those.
4. The upstream status of "pending" is incorrect; I do not see this
   patch on the lttng-dev mailing list (not that it would apply anyway).

Signed-off-by: Nathan Lynch <nathan_lynch@mentor.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>