BIND 10 #2994: Add selected few (3-4) hooks into DHCPv4 server

[BIND 10 Development]

#2994: Add selected few (3-4) hooks into DHCPv4 server
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            Reporter:  tomek         |                        Owner:
                Type:  enhancement   |  UnAssigned
            Priority:  medium        |                       Status:
           Component:  dhcp4         |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-DHCP-20130717
         Sub-Project:  DHCP          |                   Resolution:
Estimated Difficulty:  0             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Changes (by tomek):

 * owner:  tomek => UnAssigned
 * status:  accepted => reviewing


Old description:

> This is a sort of pilot ticket. Its goal is to implement 3-4 selected
> hook points to get practical understanding of the hook mechanism.
> Depending on how it goes, we will revisit (tweak) our hook design or will
> go ahead with implementation of the other hooks (see ticket #2983)

New description:

 This is a sort of pilot ticket. Its goal is to implement 3-4 selected hook
 points to get practical understanding of the hook mechanism. Depending on
 how it goes, we will revisit (tweak) our hook design or will go ahead with
 implementation of the other hooks (see ticket #2983).

--

Comment:

 The code is ready for review. The following hooks have been implemented:
 pkt4_receive, subnet4_select, lease4_select, pkt4_send.

 Developer's Guide has been updated. Also couple minor mistakes in DHCPv6
 docs were fixed as well.

 Hopefully, this code mimics all changes done in #2995 (currently merged).

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Ticket URL: <https://bind10.isc.org/ticket/2994#comment:3>
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