BIND 10 #267: python log shouldn't die with OSError

[BIND 10 Development]

#267: python log shouldn't die with OSError
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      Reporter:  jinmei   |        Owner:  zzchen_pku                 
          Type:  defect   |       Status:  reviewing                  
      Priority:  major    |    Milestone:  06. 4th Incremental Release
     Component:  logging  |   Resolution:                             
      Keywords:           |    Sensitive:  0                          
Estimatedhours:  0.0      |        Hours:                             
      Billable:  1        |   Totalhours:                             
      Internal:  0        |  
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Comment(by zzchen_pku):

 coverage report：
 ---
 Name       Stmts   Exec  Cover
 ------------------------------
 log          118    113    95%
 log_test     138    137    99%
 ------------------------------
 TOTAL        256    250    97%

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Ticket URL: <https://bind10.isc.org/ticket/267#comment:12>
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