RFR(M): 8186978: Introduce configure argument enable-cds

[Lindenmaier, Goetz]

Hi,

Tests for class data sharing (cds) are enabled if @requires vm.cds is true. 
The property vm.cds depends on the preprocessor macro ENABLE_CDS. 
This can not yet be switched by configure. It's only disabled automatically 
for the minimal build. 

This change introduces enable-cds with default true, which only takes effect 
in the non-minimal build. If disabled, generate-classlist is disabled, too.

Please review this change. I please need a sponsor.
http://cr.openjdk.java.net/~goetz/wr17/8186978-disableCDS/webrev.01/index.html

Best regards,
  Goetz.