BIND 10 #164: cmdctl: improve error messages

[BIND 10 Development]

#164: cmdctl: improve error messages
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 Reporter:  larissas  |        Owner:  each                                       
     Type:  task      |       Status:  new                                        
 Priority:  major     |    Milestone:  04. 2nd Incremental Release: Early Adopters
Component:  cmd-ctl   |   Resolution:                                             
 Keywords:            |    Sensitive:  0                                          
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Comment(by zhanglikun):

 Could Jeremy provide some detail about error message, since I think this
 task should be reported by you. Which error message should be improved, or
 added?

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Ticket URL: <https://bind10.isc.org/ticket/164#comment:2>
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