BIND 10 #2453: immediate feedback when mistyping zone name with Auth loadzone

[BIND 10 Development]

#2453: immediate feedback when mistyping zone name with Auth loadzone
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            Reporter:  jelte     |                        Owner:
                Type:  task      |                       Status:  new
            Priority:  medium    |                    Milestone:  New Tasks
           Component:  b10-auth  |                     Keywords:
           Sensitive:  0         |              Defect Severity:  N/A
         Sub-Project:  DNS       |  Feature Depending on Ticket:
Estimated Difficulty:  0         |          Add Hours to Ticket:  0
         Total Hours:  0         |                    Internal?:  0
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 Now that zones are (re)loaded in the background, the system may seem to
 succesfully load a zone when doing 'Auth loadzone <non-existent zone>' in
 bindctl. It does log an error, but it would be much better to check
 immediately.

 The proposal is to factor out the initial code from doLoadZone() in
 datasrc_clients_mgr.h, and call it both in doLoadZone, and in the loadZone
 that does the other checks (but only to see if the zone is known). This
 means doing the lookup twice, but for a loadzone command, I do not believe
 that this overhead is so much we should not check.

 Note that the clients map probably needs to be locked.

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Ticket URL: <http://bind10.isc.org/ticket/2453>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development