Fix greeter rest

rest/greeter_rest.py

+import flask
+
+app = flask.Flask(__name__)
+
+@app.route('/', methods=['GET'])
+def home():
+    return f"Hello!"
+
+@app.route('/hello/<name>', methods=['GET'])
+def hello(name):
+    return f"Hello, { name.strip() }!"
+
+app.run(host="0.0.0.0")