"SKIP_BOOT_CYCLE=false" must work in new building infrastructure

Being able to build the JDK with "SKIP_BOOT_CYCLE=false" is a mandatory test we need to
run on hotspot snapshots before they are integrated into a master JDK repo,
in order to make sure that the JDK built with this new snapshot of hotspot can be used as the
bootstrap JDK. We can't promote a JDK that can't be used for bootstrapping

So this functionality must be available in the new building infrastructure.
Until then, I will have to use the old infrastructure to test the
building of the JDK with weekly hotspot snapshots