Include condition's location (class or method name) in message

Closes gh-1787

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/SpringBootCondition.java

@@ -48,8 +48,8 @@ public abstract class SpringBootCondition implements Condition {
 			return outcome.isMatch();
 		}
 		catch (NoClassDefFoundError ex) {
-			throw new IllegalStateException(
-					"Could not evaluate condition owing to internal class not found. "
+			throw new IllegalStateException("Could not evaluate condition on "
+					+ classOrMethodName + " due to internal class not found. "
 					+ "This can happen if you are @ComponentScanning a "
 					+ "springframework package (e.g. if you put a @ComponentScan "
 					+ "in the default package by mistake)", ex);