test: don't set LITEST_VERBOSE during make check

test: don't set LITEST_VERBOSE during make check

I've never had the log output help me identify a bug during a test run. Now
that we run all tests in the same binary the verbosity just leads to a massive
file that makes it hard to find the actual failure. Turn off LITEST_VERBOSE by
default but leave the parsing in for cases where it may come in handy.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>