BIND 10 #151: XfroutClient socket location and removal

[BIND 10 Development]

#151: XfroutClient socket location and removal
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 Reporter:  jreed   |        Owner:  zhanglikun                 
     Type:  defect  |       Status:  assigned                   
 Priority:  major   |    Milestone:  05. 3rd Incremental Release
Component:  xfrout  |   Resolution:                             
 Keywords:          |    Sensitive:  0                          
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Changes (by shane):

  * owner:  shentingting => zhanglikun


Comment:

 English correction:

 "it becauses one other xfrout" -> "because another xfrout"

 Comment typo:

 "esle" -> "else"

 Comment correction:

 "should be removed" -> "will be removed"

 It's not very important, but I would move the error message out of the
 `_sock_file_in_use()` function and into the `__init()__` function before
 the `sys.exit()` call. This will make it easier to re-use the code if we
 want to have a similar technique elsewhere.

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Ticket URL: <https://bind10.isc.org/ticket/151#comment:16>
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