BIND 10 #1955: Implement perfdhcp IPv4 packet handling

[BIND 10 Development]

#1955: Implement perfdhcp IPv4 packet handling
-------------------------------------+-------------------------------------
                   Reporter:         |                 Owner:  UnAssigned
  stephen                            |                Status:  reviewing
                       Type:         |             Milestone:  DHCP-
  enhancement                        |  Sprint-20120611
                   Priority:         |            Resolution:
  medium                             |             Sensitive:  0
                  Component:         |           Sub-Project:  DHCP
  perfdhcp                           |  Estimated Difficulty:  32
                   Keywords:         |           Total Hours:  20
            Defect Severity:  N/A    |
Feature Depending on Ticket:         |
        Add Hours to Ticket:  20     |
                  Internal?:  0      |
-------------------------------------+-------------------------------------
Changes (by marcin):

 * hours:  0 => 20
 * estimatedhours:  0 => 32
 * status:  accepted => reviewing
 * owner:  marcin => UnAssigned
 * totalhours:  0 => 20


Comment:

 I added new class derived from dhcp::Pkt4 and corresponding unit tests.
 Since, both PerfPkt6 and PerfPkt4 have common logic, as a part of this
 ticket I moved the common logic to new class PktTransform. This class
 exposes static functions that can be used to operate on raw DHCP message
 buffers - needed for implementation of template files.

 The 1956 is still in review and has not been checked in to master yet.
 Since 1956 and 1955 share a lot of code I branched-off trac1955 from
 trac1956. Finally, after PktTransform had been implemented I modified v6
 packet handler to use it and removed redundant code. This change was
 checked in to trac1955. For this reason the trac1955 is the branch that
 has the latest changes for 1956 and 1955 so it makes sense to do code
 review on trac1955 for both tickets.

 Please review.

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Ticket URL: <http://bind10.isc.org/ticket/1955#comment:3>
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