test: Ignore transient user libvirtd crashes during user session shutdown
test: Ignore transient user libvirtd crashes during user session shutdown

Despite the previous commit, libvirtd still likes to SIGABRT during
session shutdown. There is no stack trace at all, and the actual test
works, so ignore this for now. If we ever do get a stack trace,  it will
be a new unexpected message and thus fail the test again -- and then we
have some data to report.

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