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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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