sysutils/facter: Drop slave port, add Java option default

Here we drop support for the slave port, since it never quite worked as
desired, nor was it ever submitted, and removes the conditionals to support it.
Also, we add a new default option FACTER_JAVA to build support for Java and
install facter.jar to be used by sysutils/puppetserver5.

Approved by: swills(mentor)
Differential Revision: D12498