RFR: 8146435: [TESTBUG] Logging tests are failing intermittently on windows when executed by JPRT

[Rachel Protacio]

Hello!

Please review this fix which adds "-Xshare:off" to all UL tests' 
ProcessBuilders to prevent windows failures. Extreme thanks to Ioi for 
debugging and finding the source of the problem.

Open webrev: http://cr.openjdk.java.net/~rprotacio/8146435/
Bug: https://bugs.openjdk.java.net/browse/JDK-8146435

Tests sent to JPRT, pass on all platforms.

Thank you!
Rachel