Added mock test. Also, updated `ssh_test.clj` for it seemed like clojure always
casts "numbers" to `long`. Throws this exception without the explicit cast:
```
1) ClassCastException on node 9:
java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Integer
at org.jclouds.ssh_test.NoOpClient.exec(ssh_test.clj:63)
at
org.jclouds.compute.callables.RunScriptOnNodeUsingSsh.runCommand(RunScriptOnNodeUsingSsh.java:107)
at
org.jclouds.compute.callables.RunScriptOnNodeUsingSsh.call(RunScriptOnNodeUsingSsh.java:80)
...omitted..
```
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