Tiny fix in mock_windows.uts test

Update README module example to support Python 3

This will support both 2.7 and 3.

layers: l2tp: parse L2TPv2 packets correctly

Signed-off-by: Speidy <speidy@gmail.com>

The current code ignores the header flags which makes every L2TP packets
parse as a data message which includes the optional 'length' field.

Signed-off-by: Speidy <speidy@gmail.com>

Replace str() with raw()

Python 3: fix make_table() sort with integers & IPs

Windows: fix version detection from git

Python 3: fix an often-failing test

Fix BERcodec_STRING

Dot11: fix .summary() with a binary SSID

sendrecv: code clean-up

RDataField treats NS, CNAME as DNS string type.

Doc maintenance

For some reason, it may happen on Travis CI (specifically with
Python 3) that port numbers are not resolved to service names. This
fixes a test that fails in this case.

[Windows] Guess metrics when InterfaceMetric is not available

Fallback on CMD when powershell is not available

Fix #791 - Throw an exception when tcpreplay can not be executed

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