Enhance 'nfsmount -m' to show IP addresses

Print the IP of servers in parens when passed the ```-m``` flag.
(Also delete trailing whitespace)
Example output:

```
$  bin/nfsmount test3  -m
test3(127.0.0.2):/mnt/export:01000700eada9a00000000000000fd01000000000000000000000000
test3(127.0.0.3):/mnt/export:01000700eada9a00000000000000fd01000000000000000000000000

$  bin/nfsmount test3
test3:/mnt/export:01000700eada9a00000000000000fd01000000000000000000000000
```

I apologize; my C is very rusty, but this compiles and runs. So it can't be that bad.