Add REALTIME_STORE and REALTIME_DESTROY dialplan functions provided by sergee.

I just added the ability to set multiple fields at once after discussions with
Tilghman and Russell.  Currently limited to 30 fields.

(closes issue #11887)
Reported by: sergee
Patches: 
      rt-func-store-destroy-multivalue.diff uploaded by otherwiseguy (license 396)
Tested by: sergee, otherwiseguy


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@102700 65c4cc65-6c06-0410-ace0-fbb531ad65f3