2.13.0: Properly work with isfile/isdir/islink
* add islink * add symlink (`os.symlink` mimic) * add chmod (`os.chmod` mimic) Signed-off-by: Aleksei Stepanov <penguinolog@gmail.com> (cherry picked from commit 5e9bea3cb29563432e268efc621487ddad9e8ec7) Signed-off-by: Aleksei Stepanov <penguinolog@gmail.com>