Determines if ssh connectivity to a cluster is working. Can only be
run against a cluster, e.g. osh(remote('mycluster', testssh()),
out()) . ssh is configured correctly if each node name is printed,
along with the output from the test command, hello , e.g.
('115', 'hello'), ('116', 'hello'), ('117', 'hello') . If
your ssh agent is set up properly, then you may see some additional
output the first time you contact a cluster, e.g. Warning:
Permanently added '192.168.140.115' (RSA) to the list of known
hosts.
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