BIND 10 #1957: Implement perfdhcp Interface Manager

[BIND 10 Development]

#1957: Implement perfdhcp Interface Manager
-------------------------------------+-------------------------------------
                   Reporter:         |                 Owner:  UnAssigned
  stephen                            |                Status:  reviewing
                       Type:         |             Milestone:  Sprint-
  enhancement                        |  DHCP-20120703
                   Priority:         |            Resolution:
  medium                             |             Sensitive:  0
                  Component:         |           Sub-Project:  DHCP
  perfdhcp                           |  Estimated Difficulty:  24
                   Keywords:         |           Total Hours:  25
            Defect Severity:  N/A    |
Feature Depending on Ticket:         |
        Add Hours to Ticket:  25     |
                  Internal?:  0      |
-------------------------------------+-------------------------------------
Changes (by marcin):

 * hours:  0 => 25
 * estimatedhours:  0 => 24
 * status:  accepted => reviewing
 * owner:  marcin => UnAssigned
 * totalhours:  0 => 25


Comment:

 Since dhcp::IfaceMgr already has lots of useful code, I simply extended it
 with the following features required by perfdhcp:

  - open socket for specified interface (interface name is specified from
 command line)
  - open socket for specified local addres (local address can be specified
 from command line instead of interface name)
  - open socket for specified remote (server) address (server address can
 be specified from command line)

 Also, I added corresponding unit tests for new methods.

 Please review the code on trac1957.

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Ticket URL: <http://bind10.isc.org/ticket/1957#comment:4>
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