Existing code uses the python libjuju unit.run in order to execute
a wait check for ca readiness across the units. The behavior of libjuju
changed between 2.x and 3.x and causes this functionality to break. This
is abstracted and handled in the zaza library, so use that code instead
as it properly handles the differences.
Signed-off-by: Billy Olsen <billy.olsen@canonical.com>
a64d2c6b03