Fix test_switch_leader failures
Fix test_switch_leader failures

The test was just wrong... it was using the default acks of 1, i.e.
local ack by the coordinator.

Closes #32.

Signed-off-by: Tom Most <41827c953d10ee0a1711438e994c1ab3c1f72d76@ciena.com>

ciena/afkak,ciena/afkak