application-prod.properties: sync Vagrant's version of the configuration.

Should be in 581f592,
423f0da and
e9473ae commits.

Addressed to #420

[ci skip]

Author: php-coder

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

@@ -1,6 +1,6 @@
 spring.profiles: prod
 
-spring.datasource.url: jdbc:mysql://localhost:3306/mystamps
+spring.datasource.url: jdbc:mysql://localhost:3306/mystamps?logger=com.mysql.jdbc.log.Slf4JLogger&useSSL=false&logSlowQueries=true&slowQueryThresholdMillis=500&autoSlowLog=false
 spring.datasource.username: mystamps
 spring.datasource.password: {{ user_db_password }}
 spring.datasource.driver-class-name: com.mysql.jdbc.Driver