[Bro-Dev] #374: Add type testing operator

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#374: Add type testing operator
-----------------------------+--------------------
 Reporter:  seth             |      Owner:
     Type:  Feature Request  |     Status:  new
 Priority:  Normal           |  Milestone:  Bro1.6
Component:  Bro              |    Version:
 Keywords:                   |
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 This is needed for generic filtering of log records in the logging
 framework.  Initial discussions have used a syntax like this:

 {{{
 function generic_outbound(rec: any)
     {
     rec$?<conn_id>cid
     ...
 }}}

 That syntax would check that the record type instance 'rec' has a field
 named 'cid' with the type 'conn_id'.

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Ticket URL: <http://tracker.icir.org/bro/ticket/374>
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