Please backport tcpdump 4.5.1-2ubuntu1 (main) from trusty

Please backport tcpdump 4.5.1-2ubuntu1 (main) from trusty to precise.

Reason for the backport:
========================
There is a comparatively new feature in TCP called TCP Fast Open (TFO) which adds new TCP header options. These header options are unknown to the currently deployed version of tcpdump (4.2.1-1ubuntu2). They are known to version 4.5.1 and later of tcpdump.

Testing:
========
Mark off items in the checklist [X] as you test them, but please leave the checklist so that backporters can quickly evaluate the state of testing.

You can test-build the backport in your PPA with backportpackage:
$ backportpackage -u ppa:<lp username>/<ppa name> -s trusty -d precise tcpdump

* precise:
[X] Package builds without modification
[X] tcpdump installs cleanly and runs

Reverse dependencies:
=====================
The following reverse-dependencies need to be tested against the new version of tcpdump. For reverse-build-dependencies (-Indep), please test that the package still builds against the new tcpdump. For reverse-dependencies, please test that the version of the package currently in the release still works with the new tcpdump installed. Reverse- Recommends, Suggests, and Enhances don't need to be tested, and are listed for completeness-sake.

tcpdump
-------
* dhcpdump
  [X] precise (Reverse-Depends)
* tcptrace
  [ ] precise (Reverse-Recommends)
* tcpflow
  [ ] precise (Reverse-Suggests)
* python-scapy
  [ ] precise (Reverse-Suggests)
* inguma
  [ ] precise (Reverse-Recommends)
* hlbr
  [ ] precise (Reverse-Recommends)
* kubuntu-active
  [ ] precise (Reverse-Recommends)
* iptotal
  [X] precise (Reverse-Depends)
* chaosreader
  [ ] precise (Reverse-Recommends)
* python-ns3-dbg
  [ ] precise (Reverse-Suggests)
* ubuntu-standard
  [ ] precise (Reverse-Recommends)
* nstreams
  [ ] precise (Reverse-Recommends)
* tcpstat
  [ ] precise (Reverse-Recommends)
* tcpreplay
  [X] precise (Reverse-Build-Depends)
* ltp-network-test
  [ ] precise (Reverse-Recommends)
* ssldump
  [ ] precise (Reverse-Suggests)
* bittwist
  [ ] precise (Reverse-Recommends)
* python-ns3
  [ ] precise (Reverse-Suggests)