Merge pull request #969 in FS/freeswitch from ~DRAGOS_OANCEA/freeswitch-dragos:fix_config_rtpip to master

* commit '3d2f3c96':
  FS-9548: return with error on wrong rtp ip given from config

* commit 'c70f06aa':
  FS-9553 #resolve [Refactor video-on-hold]

* commit '5e323ee9':
  newest version of sleep patch
  FS-8623: reapply after update: Fix libvpx Solaris Studio build
  FS-8623: reapply after update: fix sun studio build errors building libvpx
  update to libvpx b46243d from repo https://chromium.googlesource.com/webm/libvpx

Merge pull request #968 in FS/freeswitch from ~DINGDING/freeswitch:bugfix/FS-9536-fix-switch_core_hash_delete-return-invalid to master

* commit '9f01830d':
  FS-9536 [core] fix return value

FS-9525 #resolve [Client initiated REINVITE with different audio codec into conference causes choppy audio]

Merge pull request #970 in FS/freeswitch from feature/FS-9543-add-pre-exec-state-change-hooks-to to master

* commit '6a064a95':
  FS-9543 #resolve [Add pre-exec state change hooks to core]

* commit 'e76350df':
  FS-9526 [mod_conference] add deaf sounds

Merge pull request #967 in FS/freeswitch from ~PIOTRGREGOR/freeswitch:bugfix/FS-9527-freebsd-10.3-compile-error to master

* commit '0247c92c':
  FS-9527 [avmd]: Fix MAP_POPULATE on FreeBSD

Remove unsupported flag.

* commit '1c00e64a':
  FS-9533 [mod_conference] add member-enter-sound

Merge pull request #960 in FS/freeswitch from ~SJTHOMASON/freeswitch:bugfix/FS-9424-__byte_order-macro-not-defined-correctly to master

* commit '0c9ab17c':
  FS-9424: Make big endian ifdefs more specific