Fix stderr str comparison on tor keyring test
Fix stderr str comparison on tor keyring test

Previously end-of-line space characters on stderr were getting compared
to our lovely error_text match. I suspect there is a difference in how
testinfra handles strings in direct SSH vs. ansible mode. :shrug:

heartsucker/securedrop,garrettr/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,conorsch/securedrop,conorsch/securedrop,heartsucker/securedrop,conorsch/securedrop,conorsch/securedrop,ehartsuyker/securedrop,garrettr/securedrop,garrettr/securedrop,garrettr/securedrop,conorsch/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,ehartsuyker/securedrop