remove the change_owner source code

1. Remove the change_owner.c and change_owner.mode.sh.
2. Clean up the referencies from runtest files and .gitignore.
3. Fix chmod06 without -D option in ltplite and stress.part3.

Signed-off-by: Zeng Linggang <zenglg.jy@cn.fujitsu.com>
fchown/fchown04.c: add EROFS error number test

Add EROFS error number test for fchown(2)

Signed-off-by: Zeng Linggang <zenglg.jy@cn.fujitsu.com>