Initial plugin api, needs docs

packages/base/all/vendor-config-onl/src/python/onl/install/Plugin.py

@@ -0,0 +1,17 @@
+"""Plugin.py
+
+Base class for installer plugins.
+"""
+
+class Plugin(object):
+
+    def __init__(self, installer):
+        self.installer = installer
+        self.log = self.installer.log.getChild("plugin")
+
+    def run(self):
+        self.log.warn("not implemented")
+        return 0
+
+    def shutdown(self):
+        pass