tune2fs: Fix tune2fs -I so it won't corrupt RAID filesystems

tune2fs: Fix tune2fs -I so it won't corrupt RAID filesystems

If a filesystem is built with the stride extended-option (which is
often used in RAID filesystems to make sure the block and inode
allocation bitmaps don't end up hitting one disk platter harder than
the rest), this can cause tune2fs -I to corrupt the filesystem because
it fails to handle the case where the allocation bitmaps are located
after the inode table, where the inode table needs to grow.  Handle
this case correctly.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>