fix "TypeError: got <type 'str'> ('Password for user .*:') as pattern, must be one of: <type 'unicode'>, pexpect.EOF, pexpect.TIMEOUT" in auth_test.py

Author: Sergey Logvinenko

tests/auth_test.py

@@ -198,7 +198,7 @@ def test_pgpassword_and_wrong_pgpass(self):
 def run_pb_with_auth(cmd, password=None, kill=False):
     try:
         with spawn(" ".join(cmd), encoding='utf-8', timeout=10) as probackup:
-            result = probackup.expect("Password for user .*:", 5)
+            result = probackup.expect(u"Password for user .*:", 5)
             if kill:
                 probackup.kill(signal.SIGINT)
             elif result == 0: