RFR(T) : 8243933 : use driver mode in gc tests

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev//8243933/webrev.02
> 74 lines changed: 1 ins; 2 del; 71 mod;

Hi all,

could you please review this trivial patch which updates 63 gc tests to use driver mode?
from JBS:
> this is to update (some) gc tests whose main test classes just fork JVM and check their output

webrev: http://cr.openjdk.java.net/~iignatyev//8243933/webrev.02
JBS: https://bugs.openjdk.java.net/browse/JDK-8243933
testing: the updated tests

Thanks,
-- Igor