BIND 10 #1958: Implement perfdhcp statistics component

[BIND 10 Development]

#1958: Implement perfdhcp statistics component
-------------------------------------+-------------------------------------
                   Reporter:         |                 Owner:  UnAssigned
  stephen                            |                Status:  reviewing
                       Type:         |             Milestone:  Sprint-
  enhancement                        |  DHCP-20120730
                   Priority:         |            Resolution:
  medium                             |             Sensitive:  0
                  Component:         |           Sub-Project:  DHCP
  perfdhcp                           |  Estimated Difficulty:  16
                   Keywords:         |           Total Hours:  56
            Defect Severity:  N/A    |
Feature Depending on Ticket:         |
        Add Hours to Ticket:  8      |
                  Internal?:  0      |
-------------------------------------+-------------------------------------
Changes (by marcin):

 * hours:  48 => 8
 * owner:  marcin => UnAssigned
 * status:  accepted => reviewing
 * totalhours:  48 => 56


Comment:

 A set of statistics printing functions have been added.
 This imposed a couple of changes to Statistics Manager itself. Major
 changes are:
   * Moving sent and matched packets to archived list for diagnostics
   * Adding another search index to packet list (use transaction id)
   * Return average and std dev values rather than sums of delays and sum
 of squre delays
   * Change uint64_t return types to unsiged long long to get rid of casts
 when using printf
   * dhcp::Pkt6::getTransid is const so as it can be used by new index and
 for consistency with  dhcp::Pkt4::getTransid.

 Note: it seems that other getter functions in dhcp::Pkt6 are not const. It
 will be actually good to change other getters to const too but I did not
 include this change as a part of this ticket.

 Please review branch trac1958.

-- 
Ticket URL: <http://bind10.isc.org/ticket/1958#comment:5>
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