getfsstat(2) based BsdFileSystem.getMountEntries()

[Kurt Miller]

The current BsdFileSystem.getMountEntries() implementation parses
/etc/fstab. Apple doesn't use /etc/fstab so that wont work for Apple,
however all BSD's and Apple have getfsstat(2). Please test the attached
patch on OS X to see if it makes the following test program work:

*** MountTest.java ***:

import java.util.*;
import java.io.*;
import java.nio.file.*;
import java.nio.file.attribute.*;

class MountTest {
 public static void main(String[] a) {
   for (FileStore store: FileSystems.getDefault().getFileStores()) {
     System.out.println("FileStore: " + store);
     System.out.println("  type: " + store.type() +
         " isReadOnly: " + store.isReadOnly());
     try {
       FileStoreSpaceAttributes attrs =
Attributes.readFileStoreSpaceAttributes(
store);
       long total = attrs.totalSpace() / 1024;
       long used = (attrs.totalSpace() - attrs.unallocatedSpace()) / 1024;
       long avail = attrs.usableSpace() / 1024;
       System.out.format("  total %12d used %12d avail %12d%n", total,
used, ava
il);
     } catch(IOException ex) {
       ex.printStackTrace();
     }
   }
 }
}
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