[8u] RFR: 8267426 MonitorVmStartTerminate test timed out on Embedded VM

[Sergey Nazarkin]

Hi!

Please review small patch for the test that fails [1] on jdk8 built with JAVASE_EMBEDDED option. 

Embedded VM build disables [2] jvmstat instrumentation that prevent launched instance be detected by test agent. The fix [3] enables instrumentation for launched VM swarm and agent is able to detect them. 

The bug affects jdk8 only [4]. 

[1] https://bugs.openjdk.java.net/browse/JDK-8267426
[2] https://hg.openjdk.java.net/jdk8u/jdk8u-dev/hotspot/file/8c40ddd927ce/src/share/vm/runtime/globals.hpp#l3782
[3]  http://cr.openjdk.java.net/~snazarki/jdk8u-dev-webrev/8267426/
[4] https://hg.openjdk.java.net/jdk-updates/jdk11u/file/bce3c3659531/src/hotspot/share/runtime/globals.hpp#l2413