Run the LTP tests with LTP_QUIET

Run the LTP tests with LTP_QUIET

Introduce a new LTP_QUIET env var which suppresses certain
types of LTP log messages, specifically TCONF, TWARN, TINFO,
and TDEBUG.  This helps us keep the test logs briefer, while
still keeping the important information in the logs.

This update avoids several false positives, specifically with
the following testcases: eventfd2_03, shmctl05, mlock03,
poll02, prctl09, setsockopt10, and select02.

This update also adds a brief summary for the LTP testsuite,
something like the following:

> ...
> [6/7] Testing select02 ...
> [7/7] Testing setsockopt10 ...
>
> Brief LTP test results summary
> -----------------------------------------
> PASS: 6
> FAIL: 1
> -----------------------------------------
>
> TESTING FINISHED, logs in ...

Also fix the way -j param spec in auxprogs/Makefile.am.

https://bugs.kde.org/show_bug.cgi?id=509590