e2fsck: handle symlink properly with inline data

e2fsck: handle symlink properly with inline data

After fixing a bug on kernel side for handling symlink properly with
inline data, it will break the assumption in e2fsck because in original
patch set of inline data it doesn't support symlink with inline data
feature.  This commit makes e2fsck handle symlink properly with inline
data.

After applied this patch, the inline data feature has ability to store
the symlink.  We also need to add this ability for symlink commmand in
debugfs.

Cc: Ian Nartowicz <claws@nartowicz.co.uk>
Cc: Tao Ma <tm@tao.ma>
Cc: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>