Update prepare_environment.sh (#2665)

- Updated command for npm install
- Added command to install datastore

courses/developingapps/v1.3/nodejs/containerengine/start/prepare_environment.sh

@@ -22,10 +22,11 @@ echo "Making bucket: gs://$GCLOUD_BUCKET"
 gsutil mb gs://$GCLOUD_BUCKET
 
 echo "Installing dependencies"
-npm install -g [email protected]
+npm install
 npm update
 
 echo "Creating Datastore entities"
+npm install @google-cloud/datastore
 node setup/add_entities.js
 
 echo "Creating Cloud Pub/Sub topic"
@@ -36,4 +37,4 @@ echo "Creating Cloud Spanner Instance, Database, and Table"
 gcloud spanner instances create quiz-instance --config=regional-us-central1 --description="Quiz instance" --nodes=1
 gcloud spanner databases create quiz-database --instance quiz-instance --ddl "CREATE TABLE Feedback ( feedbackId STRING(100) NOT NULL, email STRING(100), quiz STRING(20), feedback STRING(MAX), rating INT64, score FLOAT64, timestamp INT64 ) PRIMARY KEY (feedbackId);"
 
-echo "Project ID: $DEVSHELL_PROJECT_ID"
+echo "Project ID: $DEVSHELL_PROJECT_ID"