RFR(S): 8201331: Better test cleanup for jdk/jfr/api/consumer/TestRecordingFile.java

[Erik Gahlin]

Hi,

Could I please have a review of this test fix for JFR.

Recording files were left behind in the /tmp directory on test machines. 
Solution is to write files to "user.dir". As part of this fix, the names 
of the test files were improved as well.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8201331

Webrev:
http://cr.openjdk.java.net/~egahlin/8201331.1/

Testing:
Tests in test/jdk/jdk/jfr

Thanks
Erik