fstests: add missing commit IDs to some tests

fstests: add missing commit IDs to some tests

Some tests are still using a 'xxx...' commit ID but the respective patches
were already merged to Linus' tree or btrfs-progs, so update them with the
correct commit IDs and in two cases update the subject as well, because it
was modified after the test case was added and before being sent to Linus
(btrfs/317 and generic/707).

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