BIND 10 #3381: Improve allocation engine IPv6 logging to distinguish between allocation types

[BIND 10 Development]

#3381: Improve allocation engine IPv6 logging to distinguish between allocation
types
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                   Reporter:  tmark   |                 Owner:
                       Type:  defect  |                Status:  new
                   Priority:  low     |             Milestone:  DHCP-Kea0.9
                  Component:  dhcp6   |              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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 During review of 3080,  marcin made the following comment:

 {{{
 > Not strictly related to this work but... DHCPSRV_ADDRESS6_ALLOC_ERROR  -
 this error message in alloc_engine is wrong because it talks about IPv6
 addresses only. If you fail to allocate the prefix (not a 128 address) it
 is quite misleading. And it was misleading when I spotted it for the first
 time in the kea log file, when running system tests.
 >
 }}}

 This issue is that the log message and its description are specific to
 address requests, yet it is used for all IPv6 allocation types. There are
 other log messages to which this also applies.

 The logging should indicate the exact nature of the failure.  If you
 have a server which is allocating both addresses and prefixes the log
 message can be misleading.

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Ticket URL: <http://bind10.isc.org/ticket/3381>
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