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don't leak on switch_ivr_wait_for_answer when peer channel is already answered or pre-answered. Found by Klockwork (www.klocwork.com)

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  * nua_stack.c: include Allow-Events in requests initiating dialog, too
    
  The Allow-Events header is now alwats included with NOTIFY requests, and
  initial INVITE, SUBSCRIBE, REFER, and OPTIONS requests.
  
  Thanks to Jerry Richards for pointing out the problem.



git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@8467 d0543943-73ff-0310-b7d9-9358b9ac24b2

  * nua_register.c: nr->nr_tport was used even if nr was NULL
  
  Problem detected by Klocwork.



git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@8466 d0543943-73ff-0310-b7d9-9358b9ac24b2

  * test_s2.c: cope if test nua uses default port



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  * test_nua_api.c: fixed crash in check_sofia



git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@8464 d0543943-73ff-0310-b7d9-9358b9ac24b2

  * test_simple.c: fixed test case for SUBSCRIBE



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Enhance python detection. Several OS do not include a python-config script (e.g. Centos, Fedora, OpenSolaris), so use the distutils module directly (like python-config does) to extract the required information. I am keeping the python-config support for now (used when distutils is not found). Several minor cleanups of the code too...

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