Property "args" is set on project level. So setting a default value inside a target wont work.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@1586585 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' of https://github.com/apache/ant into JUnit4Conversion
Add missing annotation
Remove duplicate directive
Efficiency changes to improve test runtime

- Remove sleeps used to control filetimestamp differences and directly modify file timestamps instead
- Use efficient comparison methods for testing string contents