Add Min severity option to datasource config.

src/datasource-zabbix/partials/config.html

@@ -70,4 +70,15 @@
     label="Add thresholds"
     checked="ctrl.current.jsonData.addThresholds">
   </gf-form-switch>
+  <div class="gf-form max-width-20">
+    <span class="gf-form-label width-8">Min severity</span>
+    <div class="gf-form-select-wrapper max-width-16">
+      <select class="gf-form-input" ng-model="ctrl.current.jsonData.alertingMinSeverity"
+        ng-options="s.val as s.text for s in [
+          {val: 0, text: 'Not classified'}, {val: 1, text:'Information'},
+          {val: 2, text: 'Warning'}, {val: 3, text: 'Average'},
+          {val: 4, text: 'High'}, {val: 5, text: 'Disaster'}]">
+      </select>
+    </div>
+  </div>
 </div>