Sending the following ARI commands caused Asterisk to crash if the JSON
body 'variables' object passes values of types other than strings.

POST /ari/channels
POST /ari/channels/{channelid}
PUT /ari/endpoints/sendMessage
PUT /ari/endpoints/{tech}/{resource}/sendMessage

* Eliminated RAII_VAR usage in ast_ari_channels_originate_with_id(),
ast_ari_channels_originate(), ast_ari_endpoints_send_message(), and
ast_ari_endpoints_send_message_to_endpoint().

ASTERISK-24751 #close
Reported by:  jeffrey putnam

Review: https://reviewboard.asterisk.org/r/4447/
........

Merged revisions 432404 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@432405 65c4cc65-6c06-0410-ace0-fbb531ad65f3