RFR(S): 8181592: [TESTBUG] Docker test utils and docker jdk basic test

[mikhailo]

Please review this initial drop of Docker test utils and a sanity test. 
This change lays ground
for further test development and test utils improvement in this area.

     JBS: https://bugs.openjdk.java.net/browse/JDK-8181592
     Webrev: http://cr.openjdk.java.net/~mseledtsov/8181592.00/
     Testing:
        - run this test on machine with Docker enabled - works
        - run this test on Linux-x64 with no Docker engine or Docker 
disabled - test skipped (as expected)
        - run this test on automated system - in progress


Thank you,
Misha