Rename FSJava7Test to FSTest

Since 4.0 JGit does no longer support Java versions older than Java 7 so
there is no need anymore to mention Java 7 in the class name.

Change-Id: Ic46c9d89a7e919ae4a69487fa06de0478d2b21f0
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/util/FSTest.java

@@ -61,7 +61,7 @@ import org.junit.Assume;
 import org.junit.Before;
 import org.junit.Test;
 
-public class FSJava7Test {
+public class FSTest {
 	private File trash;
 
 	@Before