btrfs: require no nodatacow for tests that exercise read repair

btrfs: require no nodatacow for tests that exercise read repair

Several test cases that exercise the ability to detect corrupted data and
repair it, fail when "-o nodatacow" is passed to MOUNT_OPTIONS, because
that ability requires the existence of data checksums, and those are
disabled in nodatacow mode. So skip the tests when "-o nodatacow" is
present.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Disseldorp <ddiss@suse.de>
Signed-off-by: Zorro Lang <zlang@kernel.org>