Consistent whitespace after imports

Update code to have a consistent number of new-line characters after
import statements.

spring-jdbc/src/main/java/org/springframework/jdbc/datasource/embedded/ConnectionProperties.java

@@ -18,7 +18,6 @@ package org.springframework.jdbc.datasource.embedded;
 
 import java.sql.Driver;
 
-
 /**
  * DataSourceFactory helper that allows essential JDBC connection properties to be configured consistently,
  * independent of the actual DataSource implementation.