Fix reload endpoint and Added docs to use this endpoint (#202)

Co-authored-by: Àlex Pérez <[email protected]>

Author: avara1986

docs/configuration.md

@@ -167,3 +167,29 @@ spec:
 ```
 
 See [Routing](routing.md) and [Examples](examples.md) to continue with this tutorial
+
+## Reload configuration without stopping your services
+
+In a production environment you may need to change the microservice's configuration without restarting it.
+
+PyMS has a feature to reload the configuration:
+
+```
+curl -X POST http://localhost:5000/reload-config
+```
+
+This endpoint calls the method `Microservice.reload_conf()`, which restarts the services, 
+the encryption configuration and initializes `create_app`.
+
+```python
+    def reload_conf(self):
+        self.delete_services()
+        self.config.reload()
+        self.services = []
+        self.init_services()
+        self.crypt.config.reload()
+        self.create_app()
+```
+
+This means that your libraries will be restarted, which is why it's important to initialize your BD, 
+your configuration inside `init_libs` method. See more info [how to use Microservice class in this link](ms_class.md)

pyms/utils/files.py

@@ -56,5 +56,6 @@ def _get_conf_from_file(self, path, fn=None):
         return files_cached[path]
 
     def reload(self, fn=None):
-        files_cached.pop(self.path, None)
+        path = self.path or self.get_path_from_env()
+        files_cached.pop(path, None)
         return self.get_file(fn)