Added migrations module for target format converting.

src/datasource-zabbix/query.controller.js

@@ -2,6 +2,7 @@ import {QueryCtrl} from 'app/plugins/sdk';
 import _ from 'lodash';
 import * as utils from './utils';
 import * as metricFunctions from './metricFunctions';
+import * as migrations from './migrations';
 
 import './add-metric-function.directive';
 import './metric-function-editor.directive';
@@ -32,6 +33,8 @@ export class ZabbixQueryController extends QueryCtrl {
 
     this.init = function() {
 
+      this.target = migrations.migrate(this.target);
+
       this.templateSrv = templateSrv;
       var target = this.target;