Set requestHangup for conference->moderator to requestHangup (not running in a ast_pbx_start thread

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5403 43c1dc8c-776e-4df2-8ef1-6e829299be21
Fix setOwner when setting to NULL (With exception for asterisk-1.8) (Fixes locking issue reported by Alena Juk)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5404 43c1dc8c-776e-4df2-8ef1-6e829299be21
Fix hangup during progress, not setting dummyHangup before going to ast_pbx_start. during requestHangup we need to re-check if pbx was not started in the meantime, to make sure we are using the right hangup method. Have not added locking during this check, so a race condition might still exist.

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5405 43c1dc8c-776e-4df2-8ef1-6e829299be21
Added a carefull sccp_wrapper_asterisk_requestHangup_PBXStarting implementation which is only used for a very short time, when ast_pbx_start has been requested, it will make sure to check autoloop and ast_channel_pbx before sending the hangup request. Replacement for setting hangup_dummy.

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5406 43c1dc8c-776e-4df2-8ef1-6e829299be21