fix(canary): fix data normalization issue

* some of the numerical data for canaries is stored as strings which
caused the UI to throw JS errors for input fields of type `number`.
added code to properly parse these values for existing canary
configurations.  new canary configurations are not affected.

app/scripts/modules/netflix/pipeline/stage/canary/canaryStage.js

@@ -1,5 +1,6 @@
 'use strict';
 
+import {toInteger} from 'lodash';
 let angular = require('angular');
 
 import {CLOUD_PROVIDER_REGISTRY} from 'core/cloudProvider/cloudProvider.registry';
@@ -137,6 +138,16 @@ module.exports = angular.module('spinnaker.netflix.pipeline.stage.canaryStage',
         this.terminateUnhealthyCanaryEnabled = true;
       }
 
+      // ensure string values from canary config are nubmers
+      const cac = cc.canaryAnalysisConfig;
+      cc.lifetimeHours = toInteger(cc.lifetimeHours);
+      cac.lookbackMins = toInteger(cac.lookbackMins);
+      cac.canaryAnalysisIntervalMins = toInteger(cac.canaryAnalysisIntervalMins);
+      if (stage.scaleUp) {
+        stage.scaleUp.delay = toInteger(stage.scaleUp.delay) || undefined;
+        stage.scaleUp.capacity = toInteger(stage.scaleUp.capacity) || undefined;
+      }
+
       if (cc.canaryAnalysisConfig.useLookback) {
         this.analysisType = 'SLIDING_LOOKBACK';
       } else {