s3: torture: Add an SMB1 POSIX specific test POSIX-SYMLINK-PARENT.

s3: torture: Add an SMB1 POSIX specific test POSIX-SYMLINK-PARENT.

This creates a directory, then a symlink to a directory,
and then checks we can POSIX create and delete file, directory,
symlink and hardlink filesystem objects under the symlink
parent directory.

Mark as knownfail until next commit.

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>