fstests: add a btrfs read_repair group

Add a new group to run all tests the exercise the btrfs read_repair code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Zorro Lang <zlang@kernel.org>
8 files changed