Add the ability to continue and originate using priority labels.

With this patch, the following two ARI commands

POST /channels
POST /channels/{id}/continue

Accept a new parameter, label, that can be used to continue to or originate
to a priority label in the dialplan.

Because this is adding a new parameter to ARI commands, the API version of
ARI has been bumped from 1.6.0 to 1.7.0.

This patch comes courtesy of Nir Simionovich from Greenfield Tech. Thanks!

ASTERISK-24412 #close
Reported by Nir Simionovich

Review: https://reviewboard.asterisk.org/r/4285



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@430337 65c4cc65-6c06-0410-ace0-fbb531ad65f3

rest-api/api-docs/channels.json

@@ -56,6 +56,14 @@
 							"allowMultiple": false,
 							"dataType": "long"
 						},
+						{
+							"name": "label",
+							"description": "The label to dial after the endpoint answers. Will supersede 'priority' if provided.",
+							"paramType": "query",
+							"required": false,
+							"allowMultiple": false,
+							"dataType": "string"
+						},
 						{
 							"name": "app",
 							"description": "The application that is subscribed to the originated channel, and passed to the Stasis application.",
@@ -204,6 +212,14 @@
 							"allowMultiple": false,
 							"dataType": "long"
 						},
+						{
+							"name": "label",
+							"description": "The label to dial after the endpoint answers. Will supersede priority, if provided",
+							"paramType": "query",
+							"required": false,
+							"allowMultiple": false,
+							"dataType": "string"
+						},
 						{
 							"name": "app",
 							"description": "The application that is subscribed to the originated channel, and passed to the Stasis application.",
@@ -356,6 +372,14 @@
 							"required": false,
 							"allowMultiple": false,
 							"dataType": "int"
+						},
+						{
+							"name": "label",
+							"description": "The label to continue to - will supersede 'priority' if both are provided.",
+							"paramType": "query",
+							"required": false,
+							"allowMultiple": false,
+							"dataType": "string"
 						}
 					],
 					"errorResponses": [