RFR: JDK-8237572: Combine the two LingeredApp classes

[Alex Menkov]

Hi all,

please review the fix for
https://bugs.openjdk.java.net/browse/JDK-8237572
webrev:
http://cr.openjdk.java.net/~amenkov/jdk15/jpsLingeredApp/webrev/

verified all test which use LangeredApp pass.

--alex