Add in plugin function capability (and make plugin validation centralized on plugin construction).

volatility/framework/plugins/__init__.py

@@ -0,0 +1,13 @@
+from volatility.framework import interfaces
+
+
+def plugin_function(plugin, context, config_path, **kwargs):
+    """Run the plugin as a function"""
+    if not isinstance(plugin, interfaces.plugins.PluginInterface):
+        raise TypeError("Plugin must be a PluginInterface derived object")
+    if not isinstance(context, interfaces.context.ContextInterface):
+        raise TypeError("Context must be a ContextInterface derived object")
+    if not isinstance(config_path, str):
+        raise TypeError("Config_path must a be string")
+    constructed = plugin(context, config_path)
+    return constructed(**kwargs)