tester: Don't retry upon exception
tester: Don't retry upon exception

The systemd service can restart the tester script, so that when
authentication is invalidated, the controlling script can login us
agian.

Signed-off-by: Fam Zheng <df9fd617995bad07eac70e27aa3fe5069270e3bd@redhat.com>

pvital/patchew,pvital/patchew,pvital/patchew,pvital/patchew