BIND 10 #2291: avoid redundant in-memory zone loading

[BIND 10 Development]

#2291: avoid redundant in-memory zone loading
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            Reporter:  jinmei    |                        Owner:
                Type:  defect    |                       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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 Due to a limitation (if not called a defect) of the current config
 framework, b10-auth runs initial configuration two-fold: once at
 the registration time followed by immediate callback, and then
 explicit calls to getRemoteConfigValue() or getFullConfig().

 The redundancy is not good in general, and it can be really annoying
 for in-memory data source configuration if it contains very large
 zones.  Commit a61af89 in #2219 tried to work this around, but based
 on review discussions it was reverted within in the branch (see the
 ticket for the discussions).

 We should either fix the fundamental config problem (preferably) or
 introduce some cleaner fix to at least this specific case.

 Note: maybe this ticket is not "estimatable" because it's not clear
 what exactly we do for the issue.

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Ticket URL: <http://bind10.isc.org/ticket/2291>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development