LU-7267 e2fsck: remove duplicated ea value size check

LU-7267 e2fsck: remove duplicated ea value size check

Remove the duplicated ea value size check in check_ea_in_inode().

Add a regression test by modifying the test in
f_valid_ea_in_inode:
- Enable EA_INODE feature to the image;
- Add a new file which has large xattr, so that this file has both
  extra space in inode and external inode for large ea.

Signed-off-by: Niu Yawei <yawei.niu@intel.com>
Change-Id: I1c1a4c444ee61d8d7e26ea878bcef56471aa9c42
Reviewed-on: http://review.whamcloud.com/16779
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Andreas Dilger <andreas.dilger@intel.com>