BIND 10 #2399: make Logger::getLoggerPtr() thread safe

[BIND 10 Development]

#2399: make Logger::getLoggerPtr() thread safe
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                   Reporter:         |                 Owner:
  jinmei                             |                Status:  new
                       Type:         |             Milestone:  Next-Sprint-
  defect                             |  Proposed
                   Priority:         |            Resolution:
  medium                             |             Sensitive:  0
                  Component:         |           Sub-Project:  DNS
  logging                            |  Estimated Difficulty:  0
                   Keywords:         |           Total Hours:  0
            Defect Severity:  N/A    |
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by muks):

 Such a mutex is in `trac2198_4`, initialized by `LoggerManager::init()`
 which is called by `initLogger()`.

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Ticket URL: <http://bind10.isc.org/ticket/2399#comment:4>
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