before test execution, print test number to syslog

before test execution, print test number to syslog

When the xfstests are executed in a batch (like "check 001-299")
and produce syslog output, it is helpful to know which test was
causing the output. Therefore each time a test is started, a
syslog message is generated that contains the number of the
xfstest.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>