Feature request: Make tshark optional again for compatibility

[SagsMug]

Small systems running OpenWRT and others don't have access to tshark, but they can use tcpdump.
So i would request that using tcpdump, and wash instead became an option.

[derv82]

Whoops. I keep forgetting people aren't running Kali. But if Wifite2 is to replace the old Wifite, I'll need to support as many setups as possible.

I don't know if/how tcpdump could detect WPS networks. But Wash certainly can (at least the latest versions -- see #62 which led to using tshark instead of wash).

1ad1747 allows Wifite to function without tshark, and falls-back to use wash for WPS detection.