Stop using system SSH config files by default.

Change-Id: I530aefeae98fabc2f73fe625f384bd5b6592178b

tobiko/shell/ssh/config.py

@@ -34,8 +34,7 @@ OPTIONS = [
                default=None,
                help=('Default SSH username')),
     cfg.ListOpt('config_files',
-                default=['/etc/ssh/ssh_config', '~/.ssh/config',
-                         './ssh_config'],
+                default=['ssh_config'],
                 help="Default user SSH configuration files"),
     cfg.StrOpt('key_file',
                default='~/.ssh/id_rsa',

tobiko/tests/unit/shell/test_ssh.py

@@ -58,6 +58,7 @@ class SSHClientFixtureTest(unit.TobikoUnitTest):
 
         ssh_config = paramiko.SSHConfig()
         for ssh_config_file in CONF.tobiko.ssh.config_files:
+            ssh_config_file = tobiko.tobiko_config_path(ssh_config_file)
             if os.path.exists(ssh_config_file):
                 with open(ssh_config_file) as f:
                     ssh_config.parse(f)