Add test for KRA clone with replicated DS

A new test has been added to verify installing CA and KRA
subsystem with DS, cloning the CA and KRA databases in DS,
then installing CA and KRA clones using the cloned CA and
KRA databases.

This process allows DS cloning to be done separately from
CA and KRA cloning which could prevent pkispawn from timing
out if the database is large.

https://github.com/dogtagpki/pki/wiki/Installing-CA-Clone-with-Replicated-DS
https://github.com/dogtagpki/pki/wiki/Installing-KRA-Clone-with-Replicated-DS