Add method to get the snapshot of given component

Author: chnyda

aptly/publisher/__init__.py

@@ -26,6 +26,11 @@ def __init__(self, client, storage=""):
         self.storage = storage
         self.timestamp = int(time.time())
 
+    def get_component_snapshot(self, component):
+        if component in self.components.keys():
+            return self.components[component][0]
+        return ""
+
     def publish(self, distribution, storage=""):
         """
         Get or create publish