[molecule.specs.skel] Add GenericSpec.output() method

molecule/cmdline.py

@@ -60,6 +60,7 @@ def parse():
         if os.path.isfile(el) and os.access(el, os.R_OK):
             obj = SpecParser(el)
             el_data = obj.parse()
+            obj.output()
             del obj
             if el_data:
                 good = check_super_user(el_data)

molecule/specs/skel.py

@@ -194,3 +194,9 @@ class GenericSpec(object):
         and executed by molecule.handlers.Runner
         """
         raise NotImplementedError()
+
+    def output(self, metadata):
+        """
+        Given the parsed metadata as input, execute any kind of logging or
+        stdout/stderr push. This method is a no-op.
+        """