Start a rednerd server alongside odoo

https://project.orus.io/project/migration-odoo-13/task/309

See also dev_doc: https://doc.xcg.io/dev_doc/en/default/redner.html

One important TODO:

    # TODO make this work without network_mode="host" (would need to use the
    # postgresql server started by this script).

odoo_scripts/config.py

@@ -75,6 +75,15 @@ class Config(object):
         self.postgresql_version = config_parser.get(
             section, "postgresql_version", fallback="9.6"
         )
+
+        self.start_mustached = config_parser.get(
+            section, "start_mustached", fallback="no"
+        ) in ("yes", "true")
+
         self.start_py3o = config_parser.get(
             section, "start_py3o", fallback="no"
         ) in ("yes", "true")
+
+        self.start_rednerd = config_parser.get(
+            section, "start_rednerd", fallback="no"
+        ) in ("yes", "true")