Add additional tests for SSH

Signed-off-by: Nathan LeClaire <nathan.leclaire@gmail.com>

libmachine/ssh/sshtest/fake_client.go

@@ -0,0 +1,21 @@
+package sshtest
+
+type CmdResult struct {
+	Out string
+	Err error
+}
+
+type FakeClient struct {
+	ActivatedShell []string
+	Outputs        map[string]CmdResult
+}
+
+func (fsc *FakeClient) Output(command string) (string, error) {
+	outerr := fsc.Outputs[command]
+	return outerr.Out, outerr.Err
+}
+
+func (fsc *FakeClient) Shell(args ...string) error {
+	fsc.ActivatedShell = args
+	return nil
+}