Fix zfs property parsing

Current property parser breaks when values contain spaces. Since
zfs get -H returns tab separated lines,  it is better to explicitly
split on tabs than on whitespace.

system/zfs

@@ -318,7 +318,7 @@ class Zfs(object):
         rc, out, err = self.module.run_command(' '.join(cmd))
         properties = dict()
         for l in out.splitlines():
-            p, v = l.split()[1:3]
+            p, v = l.split('\t')[1:3]
             properties[p] = v
         return properties