Improve filtering to handle different realtime extent sizes too.

Merge of master-melb:xfs-cmds:26834a by kenmcd.

096

@@ -32,7 +32,7 @@ _cleanup()
 
 #
 # filter out counts which will vary
-#   - blocks, agsize, agcount, device name
+#   - extsz, blocks, agsize, agcount, device name, rtextents
 # filter out differences between linux and irix:
 #   - sectsz on Linux
 #   - mmr, mixed-case on IRIX
@@ -53,6 +53,7 @@ _mkfs_filter()
 {
    tee -a $seq.full | \
    sed \
+	-e 's/extsz=[0-9][0-9]*/extsz=N   /' \
 	-e 's/blocks=[0-9][0-9]*/blocks=N/' \
 	-e 's/agsize=[0-9][0-9]*/agsize=N/' \
 	-e 's/agcount=[0-9][0-9]*/agcount=N/' \