Animal-Sniffer-Plugin for Android

Hello Tim,

I added support for animal-sniffer-plugin to Android Meterpreter, so that folks who do not have Android SDK but still want to hack on the core Meterpreter classes can be sure they do not introduce any compile-time incompatibilities for Android.

While doing it, I noticed that net_config_net_interfaces Java 1.6 implementation uses getMTU() which was added in API Level 9 (Gingerbread), so I downgraded the used implementation for this command to Java 1.4 implementation, which does not need any API not available in API Level 3.

See #1708