catch termios.error (linux).

For some reason py.test isn't in a terminal. On linux (travis) its
throwing general "error: (25, 'Inappropriate ioctl for device')" which
I'm hoping is termios.error, otherwise we'll have to catch 'Exception'
again.

pexpect/__init__.py

@@ -503,7 +503,7 @@ def __init__(self, command, args=[], timeout=30, maxread=2000,
             fd = sys.__stdin__.fileno()
             self._INTR = ord(termios.tcgetattr(fd)[6][VINTR])
             self._EOF = ord(termios.tcgetattr(fd)[6][VEOF])
-        except (ImportError, OSError, IOError):
+        except (ImportError, OSError, IOError, termios.error):
             # unless the controlling process is also not a terminal,
             # such as cron(1). Fall-back to using CEOF and CINTR.
             try: