lslocks: new command

lslocks: new command

The new lslocks(8) program is meant to replace the deprecated lslk(8). It is
designed for simplicity and removes unnecessary Unix legacy outputs and
options:

- Don't output inode number, whence and maj:min device numbers.
- Don't provide nonblocking syscall options stat(2) and readlink(2)
- Remove lslk's alternate default kernel name list file path (-k)

The option to use nonblocking calls was previously intended for NFS partitions;
however this should be transparent to utility programs considering that
timeouts can occur generically (fuse - sshfs, NFS, netdevs, etc).

Signed-off-by: Davidlohr Bueso <dave@gnu.org>
Signed-off-by: Karel Zak <kzak@redhat.com>