Consistent whitespace after imports

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

spring-core/src/main/java/org/springframework/util/MimeType.java

@@ -27,7 +27,6 @@ import java.util.Locale;
 import java.util.Map;
 import java.util.TreeSet;
 
-
 /**
  * Represents a MIME Type, as originally defined in RFC 2046 and subsequently used in
  * other Internet protocols including HTTP. This class however does not contain support

spring-core/src/main/java/org/springframework/util/StreamUtils.java

@@ -27,7 +27,6 @@ import java.io.OutputStreamWriter;
 import java.io.Writer;
 import java.nio.charset.Charset;
 
-
 /**
  * Simple utility methods for dealing with streams. The copy methods of this class are
  * similar to those defined in {@link FileCopyUtils} except that all affected streams are