BIND 10 #422: Implement memory Data Source Class

[BIND 10 Development]

#422: Implement memory Data Source Class
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  Reporter:  zzchen_pku   |            Owner:     
      Type:  task         |           Status:  new
  Priority:  major        |        Milestone:     
 Component:  data source  |         Keywords:     
 Sensitive:  0            |   Estimatedhours:  0  
     Hours:  0            |         Billable:  1  
Totalhours:  0            |         Internal:  0  
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 The MemoryDataSrc contains a ZoneTable object, which consists of (pointers
 to) MemoryZone (see below) objects. For now, we don't make it a derived
 class of AbstractDataSrc because the interface is so different (we'll
 eventually consider this as part of the generalization work). This class
 has two methods:
     * addZone(): takes a (shared)pointer to MemoryZone and stores it to
 the ZoneTable
     * findZone(): takes a domain name and returns the best matching
 MemoryZone in the form of ConstZonePtr

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Ticket URL: <http://bind10.isc.org/ticket/422>
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