RFR 8055901: Update policytool for jdk.net.NetworkPermission

[Wang Weijun]

Hi Michael

Please review the code change at

   http://cr.openjdk.java.net/~weijun/8055901/webrev.00/

With this change, the policy tool can generate a file like

grant {
  permission jdk.net.NetworkPermission "setOption.SO_FLOW_SLA";
};

Please confirm the grammar is correct.

BTW, I also add some missing targets in a nearby permission type.

Noreg-trivial.

Thanks
Max