Add missing quotes in ptest runner. Without these it runs all gnome tests
which is why the counts in my minimal image tests differed from those on the
main autobuilder core-image-sato runs.
Also fix an error showing in the ptest logs where invalid options were being
passed to busybox du.
(From OE-Core rev: dc0c916e610297063821450761c17e10c53bb4dd)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
d45b583da7