RFR: 8146728: TestPrintGCDetailsVerbose is never run by jtreg

[Kim Barrett]

New webrev:
incr: http://cr.openjdk.java.net/~kbarrett/8146728/webrev.01.incr/
full: http://cr.openjdk.java.net/~kbarrett/8146728/webrev.01/

Removed the @requires from the test.

Backed out the addition of the jdk.debug @requires property from the
TEST.ROOT configuration file, since it isn't presently needed after
all.