Merged revisions 322425 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.8

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  r322425 | rmudgett | 2011-06-08 13:46:30 -0500 (Wed, 08 Jun 2011) | 16 lines
  
  SRV lookup attempted for SIP peers listed as an IP address.
  
  Asterisk attempts to SRV lookup a host name even if the host name is an IP
  address.  Regression introduced when IPv6 support was added.
  
  * Restored the check in ast_dnsmgr_lookup() to see if the given host name
  is an IP address.  The IP address could be in either IPv4 or IPv6 formats.
  
  (closes issue ASTERISK-17815)
  Reported by: Byron Clark
  Tested by: Byron Clark, Richard Mudgett
  Patches:
       issue19248_v1.8.patch - uploaded by Richard Mudgett (License #5621)
  
  Review: https://reviewboard.asterisk.org/r/1240/
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@322426 65c4cc65-6c06-0410-ace0-fbb531ad65f3