BIND 10 #2633: Improve log messages in the DHCP Config Managers

[BIND 10 Development]

#2633: Improve log messages in the DHCP Config Managers
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                   Reporter:         |                 Owner:
  marcin                             |                Status:  new
                       Type:         |             Milestone:  DHCP
  defect                             |  Outstanding Tasks
                   Priority:         |              Keywords:
  medium                             |             Sensitive:  0
                  Component:         |           Sub-Project:  DHCP
  dhcpconf                           |  Estimated Difficulty:  0
               CVSS Scoring:         |           Total Hours:  0
            Defect Severity:  Low    |
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 In the DHCP configuration parsers (src/bin/dhcp4/config_parser.cc and
 src/bin/dhcp6/config_parser.cc) a number of log messages should be
 improved. Corrections to log messages include but are not limited to:
 - ensure that all log messages start with a lower-case letter or that all
 messages start with upper-case letter, currently it is not consistent
 - some of the log messages are prefixed with e.g. !''Parser error: ...!'',
 some not, whether this prefix is used or not should be consistent across
 all log messages
 - many massages are vague as they don't refer to a particular item in the
 configuration, e.g. fictitious log message: !''Invalid parameter of the
 option!'' should be rather logged as !''Invalid parameter foo of the
 option isc.foo, having code 1234!''. etc.

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Ticket URL: <http://bind10.isc.org/ticket/2633>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development