Set default value for hostname

This will avoid raising KeyError exceptions when trying to fetch the
value of the HOSTNAME env variable on faasd.

Signed-off-by: Mehdi Yedes <mehdi.yedes@gmail.com>

Author: mehyedes

template/python3-http-armhf/index.py

@@ -17,7 +17,7 @@ def __init__(self):
 
 class Context:
     def __init__(self):
-        self.hostname = os.environ['HOSTNAME']
+        self.hostname = os.getenv('HOSTNAME', 'localhost')
 
 def format_status_code(resp):
     if 'statusCode' in resp:
@@ -66,4 +66,4 @@ def call_handler(path):
     return resp
 
 if __name__ == '__main__':
-    serve(app, host='0.0.0.0', port=5000)
+    serve(app, host='0.0.0.0', port=5000)

template/python3-http/index.py

@@ -17,7 +17,7 @@ def __init__(self):
 
 class Context:
     def __init__(self):
-        self.hostname = os.environ['HOSTNAME']
+        self.hostname = os.getenv('HOSTNAME', 'localhost')
 
 def format_status_code(resp):
     if 'statusCode' in resp:
@@ -66,4 +66,4 @@ def call_handler(path):
     return resp
 
 if __name__ == '__main__':
-    serve(app, host='0.0.0.0', port=5000)
+    serve(app, host='0.0.0.0', port=5000)