BIND 10 #2758: util/io_utilities.h shouldn't be used in production DHCP code

[BIND 10 Development]

#2758: util/io_utilities.h shouldn't be used in production DHCP code
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                   Reporter:  jinmei  |                 Owner:
                       Type:  defect  |                Status:  new
                   Priority:  medium  |             Milestone:  New Tasks
                  Component:  dhcp    |              Keywords:
               CVSS Scoring:          |             Sensitive:  0
            Defect Severity:  N/A     |           Sub-Project:  DHCP
Feature Depending on Ticket:          |  Estimated Difficulty:  0
        Add Hours to Ticket:  0       |           Total Hours:  0
                  Internal?:  0       |
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 See http://bind10.isc.org/ticket/2749#comment:2

 dhcp6_srv.cc, etc, should use other (and safer) API instead of
 this stuff.

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Ticket URL: <http://bind10.isc.org/ticket/2758>
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