chore(application-prod.properties): reduce logs on prod.

- don't show controller mappings
- don't show response headers from MailGun

[skip ci]

Author: php-coder

infra/vagrant/provisioning/roles/mystamps-app/templates/application-prod.properties

@@ -30,6 +30,9 @@ logging.file: /data/logs/mystamps.log
 logging.level.root: INFO
 logging.level.ru.mystamps: DEBUG
 logging.level.ru.mystamps.web.support.spring.security.SessionLocaleResolverAwareFilter: INFO
+logging.level.ru.mystamps.web.support.mailgun.ApiMailgunEmailSendingStrategy: INFO
+logging.level.org.springframework.web.servlet.handler.SimpleUrlHandlerMapping: WARN
+logging.level.org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping: WARN
 
 app.upload.dir: /data/uploads
 app.preview.dir: /data/preview