tests/main: Fix unhelpful ssh_config test
tests/main: Fix unhelpful ssh_config test

SystemExit is always raised, so this wasn't doing anything. Actually
look at the output.

Signed-off-by: Zack Cerza <d7cdf09fc0f0426e98c9978ee42da5d61fa54986@redhat.com>

alfredodeza/ceph-doctor