tests: make pyflakes happy with outOfProcess tests

This patch fixes

python -c 'import pyflakes; print("pyflakes-%s" % pyflakes.__version__)'
pyflakes-0.8.1
find . -path './.git' -prune -type f -o \
	-name '*.py' -o -name '*.py.in'  | xargs
/home/fromani/.local/bin/pyflakes | \
	grep -w -v "\./vdsm/storage/lvm\.py.*: list comprehension
redefines 'lv' from line .*" | \
	while read LINE; do echo "$LINE"; false; done
./tests/outOfProcessTests.py:31: 'config' imported but unused

Change-Id: I5aa3ea1f1d26ff633a70317c10d456465c39ed74
Signed-off-by: Francesco Romani <fromani@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/34896
Reviewed-by: Nir Soffer <nsoffer@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>