IPv6 unit tests now work when IPv6 is not available

Fix EDNS0 live unit tests

Fix StreamSocket on OS X

This fix #162

DNS: follow the "default values that work" logic

wrpcap: accept packets from an `SndRcvList()` object

New read_routes6() function and unit tests

Check read_routes6() output

  - recursion desired (DNS.rd) defaults to 1
  - question defaults to IN A for www.example.com (DNSQR.qname)

Dict creation can be literal

List literal

Chained comparisons can be simplified

Default argument shouldn't be mutable

"Add" support for mDNS

[IGMP V3] fix number of source address

Fix NTP TimeStampField.any2i()

Restart select when we see a EINTR

This fixes erratic behavior when scapy is run inside of a separate
thread or in another process.
The patch is taken from
https://bitbucket.org/secdev/scapy/issues/473/scapy-sendrecv-selects-eintr-problem-in

Code cleanup / optimization

Bluetooth: Add HCI LE Create Connection Cancel & HCI Disconnect packets