test: Expect sudo failure messages in TestLogin.testConversation
test: Expect sudo failure messages in TestLogin.testConversation

It tries to login with bogus user/password, and we get sudo failures
from that.

garrett/cockpit,martinpitt/cockpit,deryni/cockpit,deryni/cockpit,deryni/cockpit,cockpit-project/cockpit,deryni/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,martinpitt/cockpit,deryni/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,deryni/cockpit,mvollmer/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,garrett/cockpit,moraleslazaro/cockpit,garrett/cockpit,cockpit-project/cockpit,mvollmer/cockpit,mvollmer/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,garrett/cockpit,deryni/cockpit,garrett/cockpit,mvollmer/cockpit,martinpitt/cockpit