Tests: Skip ssh related test conditionally

If there is no ssh tool present in PATH the test will
fail, so do not expect all machines having ssh explicitly
defined in PATH.

Change-Id: Ic56898ac6a31e75cd2efae6f10464a9aab04b326
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

tests/auto/ssh/tst_ssh.cpp

@@ -143,6 +143,9 @@ void tst_Ssh::errorHandling_data()
 
 void tst_Ssh::errorHandling()
 {
+    if (SshSettings::sshFilePath().isEmpty())
+        QSKIP("No ssh found in PATH - skipping this test.");
+
     QFETCH(QString, host);
     QFETCH(quint16, port);
     QFETCH(SshConnectionParameters::AuthenticationType, authType);