BIND 10 #2798: Add a log message that statistics is updated

[BIND 10 Development]

#2798: Add a log message that statistics is updated
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                   Reporter:         |                 Owner:
  y-aharen                           |                Status:  new
                       Type:         |             Milestone:  New Tasks
  enhancement                        |              Keywords:
                   Priority:         |             Sensitive:  0
  medium                             |           Sub-Project:  DNS
                  Component:         |  Estimated Difficulty:  0
  statistics                         |           Total Hours:  0
               CVSS Scoring:         |
            Defect Severity:  N/A    |
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 Put a debug log message when statistics is updated. It's to ensure the
 statistics are updated at b10-stats in lettuce tests. It was suggested in
 the review of #2157.

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Ticket URL: <http://bind10.isc.org/ticket/2798>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development