Simplify data source configuration.

DataSourceConfiguration has already enabled data source validation.

See also spring-boot GH 4906

Addressed to #413

No functional changes.

Author: php-coder

src/main/resources/application-travis.properties

@@ -5,8 +5,6 @@ spring.datasource.username: travis
 spring.datasource.password:
 spring.datasource.driver-class-name: com.mysql.jdbc.Driver
 spring.datasource.initialize: false
-spring.datasource.dbcp.validation-query: SELECT 1
-spring.datasource.dbcp.test-on-borrow: true
 
 spring.mail.host: 127.0.0.1
 spring.mail.port: 1025

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

@@ -5,8 +5,6 @@ spring.datasource.username: mystamps
 spring.datasource.password: {{ user_db_password }}
 spring.datasource.driver-class-name: com.mysql.jdbc.Driver
 spring.datasource.initialize: false
-spring.datasource.dbcp.validation-query: SELECT 1
-spring.datasource.dbcp.test-on-borrow: true
 
 spring.mail.host: smtp.mailgun.org
 spring.mail.port: 25