[TLS] Enable DES

Add TLS support

* Improved main.py tests

* Small fixes

* Fix whois on Windows

* Better whois server and parsing

* Small fixes

[coverage] Tests for scapy/asn1/*

Add callbacks to EnumFields for large ranges

Ask for python-cryptography v1.7+ in warnings and documentation

  - this feature allows conversion of large ranges where
    all entries coalesce to the same representation without bloating
    a dict. For instance, 0x0 to 0xffff all display as "toto" except
    a few odds 0x2 which are displayed as "tutu".
    Before this feature, you needed to write
    enum = {x: 'toto' for x in xrange(0, 0xffff)
    enum[2] = 'tutu'
    XShortEnumField('test', 0, enum)

[Windows/Two lines fix] autocompletion

Fix issue #408 : complex ASN1 fields randval()

PPTP support (Enhanced GRE, PPP LCP, PPTP Control Connection)

[OneLineFix/TCPreplay] Replaced file_cache by preload_pcap

[coverage] Dot11 tests

inet_{pton,ntop}: reorganize, cleanup and improve tests

[coverage] SCTP & DHCP tests

Error out incorrect IPv4 format in IPv6 addresses in inet_pton

Enhance and fix ls()