Changed the logging level of invalid property files to warning

PR:	1451


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@269319 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/Property.java

@@ -198,8 +198,8 @@ public class Property extends Task {
                 }
                 addProperties(props);
             } else {
-                log("Unable to find " + file.getAbsolutePath(), 
-                    Project.MSG_VERBOSE);
+                log("Unable to find property file: " + file.getAbsolutePath(), 
+                    Project.MSG_WARN);
             }
         } catch(Exception ex) {
             throw new BuildException(ex.getMessage(), ex, location);