[10] Review request: 8184996: Add single instance swing app for ant version

[victor . drozdov]

Chris,

Please review my changes about adding single instance swing app for ant 
version

JIRA:  https://bugs.openjdk.java.net/browse/JDK-8184996
Webrev:http://cr.openjdk.java.net/~vdrozdov/JDK-8184996/webrev.00/ 
<http://cr.openjdk.java.net/%7Evdrozdov/JDK-8184996/webrev.00/>

--Victor