Adds support for Pioneer AVR interface port number (#3878)

* Adds support for Pioneer AVR interface port number

https://community.home-assistant.io/t/support-for-pioneer-avr/503
telnetlib supports a port number so adding port as
an optional config element with a default of 23 resolves this.

* Adds timeout to Pioneer AVR

timeout in telnetlib defaults to socket._GLOBAL_DEFAULT_TIMEOUT
which is not a value, but rather a bare Object used for comparison.

telnetlib says the following about the timeout optional argument:
"The optional timeout parameter specifies a timeout in seconds
 for blocking operations like the connection attempt (if not
 specified, the global default timeout setting will be used)."

From the documentation for sockets:
"Sockets are by default always created in blocking mode"

Catching connect and timeout errors, logging to debug
and continuing.

* Catches timeout exceptions, logs and continues.

homeassistant/helpers/config_validation.py

@@ -3,6 +3,7 @@ from collections import OrderedDict
 from datetime import timedelta
 import os
 from urllib.parse import urlparse
+from socket import _GLOBAL_DEFAULT_TIMEOUT
 
 from typing import Any, Union, TypeVar, Callable, Sequence, Dict
 
@@ -306,6 +307,24 @@ def time_zone(value):
 weekdays = vol.All(ensure_list, [vol.In(WEEKDAYS)])
 
 
+def socket_timeout(value):
+    """Validate timeout float > 0.0.
+
+    None coerced to socket._GLOBAL_DEFAULT_TIMEOUT bare object.
+    """
+    if value is None:
+        return _GLOBAL_DEFAULT_TIMEOUT
+    else:
+        try:
+            float_value = float(value)
+            if float_value > 0.0:
+                return float_value
+            raise vol.Invalid('Invalid socket timeout value.'
+                              ' float > 0.0 required.')
+        except Exception as _:
+            raise vol.Invalid('Invalid socket timeout: {err}'.format(err=_))
+
+
 # pylint: disable=no-value-for-parameter
 def url(value: Any) -> str:
     """Validate an URL."""