title: Hibernate is slow at startup with Running schema validator
body: <p>I've been running Spring-Boot with JPA and a Postgres Database.
  Depending on my network environment the starting phase is blocking for more than 15 sec on :</p>
  
  <pre><code>INFO  o.h.tool.hbm2ddl.SchemaValidator - HHH000229: Running schema validator
  </code></pre>
  
  <p>The strange thing is that my Database is local.
  Any idea ?</p>
  
  <pre><code>    spring.jpa.properties.hibernate.temp.use_jdbc_metadata_defaults=false
      spring.jpa.hibernate.ddl-auto= validate
      spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect
      spring.datasource.driverClassName=org.postgresql.Driver
      spring.datasource.url=jdbc:postgresql://localhost:5432/cine
  </code></pre>