standalone_test: Remove unused import

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
run: Introduce test job stats display

It is frequently useful to know how long a total
test sequence took to run, how many tests passed
and failed total, and the success rate, specially
in longer test jobs. Create a report function
that displays this info. As an example, here it's
how it looks:

./run -t qemu --tests migrate.with_reboot
SETUP: PASS (1.30 s)
DATA DIR: /home/lmr/virt_test
DEBUG LOG:
/home/lmr/Code/virt-test.git/logs/run-2013-02-18-16.46.48/debug.log
TESTS: 4
(1/4) migrate.with_reboot.tcp: PASS (51.62 s)
(2/4) migrate.with_reboot.unix: PASS (52.86 s)
(3/4) migrate.with_reboot.exec: FAIL (409.05 s)
(4/4) migrate.with_reboot.fd: PASS (59.65 s)
TOTAL TIME: 573.19 s (09:33)
TESTS PASSED: 3
TESTS FAILED: 1
SUCCESS RATE: 75.00 %

Make this reporting function print both to stdout and
to the debug log.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>