Update createapp.sh

Author: yongkanghe

createapp.sh

@@ -1,6 +1,6 @@
 echo "-------Creating an app registration for K10"
 AZURE_SUBSCRIPTION_ID=$(az account list --query "[?isDefault][id]" --all -o tsv)
-az ad sp create-for-rbac --name https://aks4yong1-k10-app --role Contributor --scopes /subscriptions/$AZURE_SUBSCRIPTION_ID > aks4yong1app
+az ad sp create-for-rbac --name https://aks4yong1-k10-app --role Contributor --scopes /subscriptions/$AZURE_SUBSCRIPTION_ID -o json > aks4yong1app
 
 clear