BIND 10 #2198: make sure InterprocessSyncLocker is thread safe

[BIND 10 Development]

#2198: make sure InterprocessSyncLocker is thread safe
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                   Reporter:         |                 Owner:  vorner
  jinmei                             |                Status:  reviewing
                       Type:         |             Milestone:
  defect                             |  Sprint-20121023
                   Priority:         |            Resolution:
  medium                             |             Sensitive:  0
                  Component:         |           Sub-Project:  Core
  logging                            |  Estimated Difficulty:  5
                   Keywords:         |           Total Hours:  3.25
            Defect Severity:  N/A    |
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Changes (by muks):

 * owner:  muks => vorner
 * status:  reopened => reviewing


Comment:

 Up for review. The changes for the above issues should be self-
 explanatory.

 * On Mac OS, one more change was made to make it look in the `builddir`
 for libb10-threads library.
 * Two objects are left created (leaked) in InterprocessSyncFile to avoid
 the static destruction fiasco. This is not a leak worth bothering though
 as it doesn't grow with time. With some clever arrangement of
 instantiation, we can avoid the static destruction fiasco, but I think the
 approach in the branch is safer.

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Ticket URL: <http://bind10.isc.org/ticket/2198#comment:25>
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