Fix plugins after former refactoring

plugins/dump.py

 class Plugin(sardine.BasePlugin):
 
     def render_plain(self):
-        out = "args = %s" % repr(self.args)
+        out = "args = %s" % repr(self.data.args)
         return out

plugins/sh.py

 class Plugin(sardine.BasePlugin):
 
     def render_plain(self):
-        return subprocess.check_output(self.args)
+        return subprocess.check_output(self.data.args)