BIND 10 #3037: Hook API and code improvements

[BIND 10 Development]

#3037: Hook API and code improvements
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            Reporter:  tomek         |                        Owner:
                Type:  enhancement   |                       Status:  new
            Priority:  medium        |                    Milestone:  DHCP
           Component:  dhcp          |  Outstanding Tasks
            Keywords:                |                   Resolution:
           Sensitive:  0             |                 CVSS Scoring:
         Sub-Project:  DHCP          |              Defect Severity:
Estimated Difficulty:  0             |  Medium
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by tomek):

 2. Change bool skip flag into int returnAction (see discussion in #2995).

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Ticket URL: <https://bind10.isc.org/ticket/3037#comment:1>
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