The "addzone" and "shutdown" system tests currently invoke rndc using test-specific helper code. Rework the relevant bits of those tests so that they use the helper classes from bin/tests/system/isctest.py.
The "addzone" and "shutdown" system tests currently invoke rndc using test-specific helper code. Rework the relevant bits of those tests so that they use the helper classes from bin/tests/system/isctest.py.