Update ShellPropertiesTests to expect whitespace to be trimmed

The latest Spring Framework 4.2.3 snapshots appear to be trimming
whitespace as part of the binding process. This commit updates the
test's expectations accordingly.

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/autoconfigure/ShellPropertiesTests.java

@@ -300,7 +300,7 @@ public class ShellPropertiesTests {
 		Properties p = new Properties();
 		props.applyToCrshShellConfig(p);
 
-		assertEquals("role1, role2", p.get("crash.auth.spring.roles"));
+		assertEquals("role1,role2", p.get("crash.auth.spring.roles"));
 	}
 
 	@Test