Merged revisions 205120 via svnmerge from

Merged revisions 205120 via svnmerge from
https://origsvn.digium.com/svn/asterisk/trunk

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  r205120 | russell | 2009-07-08 10:17:19 -0500 (Wed, 08 Jul 2009) | 16 lines

  Move OpenSSL initialization to a single place, make library usage thread-safe.

  While doing some reading about OpenSSL, I noticed a couple of things that
  needed to be improved with our usage of OpenSSL.

  1) We had initialization of the library done in multiple modules.  This has now
     been moved to a core function that gets executed during Asterisk startup.
     We already link OpenSSL into the core for TCP/TLS functionality, so this
     was the most logical place to do it.

  2) OpenSSL is not thread-safe by default.  However, making it thread safe is
     very easy.  We just have to provide a couple of callbacks.  One callback
     returns a thread ID.  The other handles locking.  For more information,
     start with the "Is OpenSSL thread-safe?" question on the FAQ page of
     openssl.org.
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