jittester shouldn't use non-deterministic System methods

Attached test failed with
java.lang.RuntimeException: Actual stdout isn't equal to golden one: expected [Test_341.var_257 = null
Test_341.var_259 = null
Test_341.var_254 = 700071916933788
Test_341.var_256 = null
Test_341.var_255 = null
Test_341.var_258 = 0
Test_341.var_260 = 21992]
 to equal [Test_341.var_257 = null
Test_341.var_259 = null
Test_341.var_254 = 10898224812728893
Test_341.var_256 = null
Test_341.var_255 = null
Test_341.var_258 = 0
Test_341.var_260 = 21992]

at jdk.test.lib.Asserts.fail(Asserts.java:594)
at jdk.test.lib.Asserts.assertEquals(Asserts.java:205)
at jdk.test.lib.Asserts.assertEQ(Asserts.java:178)
at jdk.test.lib.jittester.jtreg.JitTesterDriver.main(JitTesterDriver.java:62)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:298)
at java.base/java.lang.Thread.run(Thread.java:832)

JavaTest Message: Test threw exception: java.lang.RuntimeException
JavaTest Message: shutting down test