RFR(S): 8223217: [TESTBUG] Create JFR tests with JMX across container boundary

[mikhailo.seledtsov at oracle.com]

Please review this change that tests JFR operations across container 
boundary while using JMX to control JFR.
The test starts a container running a simple event producer, establishes 
a JMX connection, uses FlightRecorderMXBean to start the recording, stop 
and dump the recording, then transfers recording from the container.
Simple verification is performed on the transferred recording, making 
sure that the expected test event is present.

     JBS: https://bugs.openjdk.java.net/browse/JDK-8223217
     Webrev: http://cr.openjdk.java.net/~mseledtsov/8223217.01/
     Testing:
         1. Ran the newly created test at least 30 times on a Linux-x64 
host with docker engine configured - PASSED
         2. Ran the test at least 20 times on a test cluster: ALL PASS
         3. Ran all hotspot/containers tests on the test cluster: PASS


Thank you,
Misha