[Bro-Dev] #969: Add reverse function to strings.bif

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#969: Add reverse function to strings.bif
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 Reporter:  yun         |       Type:  Patch
   Status:  new         |   Priority:  Low
Milestone:  Bro2.2      |  Component:  Bro
  Version:  git/master  |   Keywords:
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 Attached is a patch to have a "reverse" function so you can reverse a
 (byte)string.

 Tests are also included.

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Ticket URL: <http://tracker.bro.org/bro/ticket/969>
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