RFR(S): 8224264: [TESTBUG] HelloDynamicCustom.java test failed on the Windows platform in tiers 6 and 7 testing

[Calvin Cheung]

bug: https://bugs.openjdk.java.net/browse/JDK-8224264
webrev: http://cr.openjdk.java.net/~ccheung/8224264/webrev.00/

Rewrote the test by making use of the DynamicArchiveTestBase class so 
that mapping failure can be handled more robustly.

Ran the test on the two Windows hosts where the bug was reproduced. Test 
was repeated 30 times on each host, one with the Tier6 vm options, the 
other one with the Tier7 vm options.

thanks,
Calvin