attach SR drive by force even if not all chunks provide native metadata

[Karel Gardas]

Hello,

following patch fixes issue while attempting to attach SR RAID1 drive
where not all chunks provide native metadata. I.e. one chunk is dd
zeroed. The complain of SR is good one, but I'd think that force
parameter should overcome it and really enforce SR to attach such
drive.

Thanks,
Karel

diff -u -p -u -r1.377 softraid.c
--- softraid.c  20 Jul 2016 20:45:13 -0000      1.377
+++ softraid.c  23 Sep 2016 22:06:55 -0000
@@ -1658,7 +1661,7 @@ sr_meta_native_attach(struct sr_discipli
                        not_sr++;
        }

-       if (sr && not_sr) {
+       if (sr && not_sr && !force) {
                sr_error(sc, "not all chunks are of the native metadata "
                    "format");
                goto bad;