Began rewrite with more modular design

inputs/alfred/__init__.py

@@ -0,0 +1,18 @@
+import subprocess
+import json
+
+class Input:
+    def __init__(self,request_data_type = 158):
+        self.request_data_type = request_data_type
+
+    def get_data(self, nodedb):
+        """Add data from alfred to the supplied nodedb"""
+        output = subprocess.check_output([
+            "alfred-json",
+            "-r", str(self.request_data_type),
+            "-f", "json",
+        ])
+        alfred_data = json.loads(output.decode("utf-8"))
+
+        for mac, node in alfred_data.items():
+            nodedb.add_or_update([mac], node)