RFR(S): 8219997: [TESTBUG] Create test for JFR events in Docker container: CPU, Memory and Process Info

[mikhailo.seledtsov at oracle.com]

Please review this new test that verifies that certain JFR events report 
correct data when JVM is run inside a Docker container. The test has 3 
test cases, testing the following events: CPUInformation, PhysicalMemory 
and SystemProcess. The test launches Docker containers with resource 
parameters that are limited and less than available on the host system, 
and verifies that events report resource values based on container data, 
not the host data.

     JBS: https://bugs.openjdk.java.net/browse/JDK-8219997
     Webrev: http://cr.openjdk.java.net/~mseledtsov/8219997.01/
     Testing: ran the test 50 times on Linux-x64 - All PASS

Thank you,
Misha