use sane defaults for openzwave config

Use sane default if libopenzwave is installed. In most cases this will
mean that the zwave config path will not need to e manually specified.

homeassistant/components/zwave.py

@@ -6,7 +6,6 @@
 """
 import logging
 import os.path
-import sys
 import time
 from pprint import pprint
 
@@ -25,8 +24,6 @@
 CONF_DEBUG = "debug"
 CONF_POLLING_INTERVAL = "polling_interval"
 CONF_POLLING_INTENSITY = "polling_intensity"
-DEFAULT_ZWAVE_CONFIG_PATH = os.path.join(sys.prefix, 'share',
-                                         'python-openzwave', 'config')
 
 # How long to wait for the zwave network to be ready.
 NETWORK_READY_WAIT_SECS = 30
@@ -175,10 +172,14 @@ def setup(hass, config):
     # pylint: disable=global-statement, import-error
     global NETWORK
 
+    import libopenzwave
     from pydispatch import dispatcher
     from openzwave.option import ZWaveOption
     from openzwave.network import ZWaveNetwork
 
+    default_zwave_config_path = os.path.join(os.path.dirname(
+        libopenzwave.__file__), 'config')
+
     # Load configuration
     use_debug = str(config[DOMAIN].get(CONF_DEBUG)) == '1'
     customize = config[DOMAIN].get(CONF_CUSTOMIZE, {})
@@ -188,7 +189,7 @@ def setup(hass, config):
         config[DOMAIN].get(CONF_USB_STICK_PATH, DEFAULT_CONF_USB_STICK_PATH),
         user_path=hass.config.config_dir,
         config_path=config[DOMAIN].get('config_path',
-                                       DEFAULT_ZWAVE_CONFIG_PATH),)
+                                       default_zwave_config_path),)
 
     options.set_console_output(use_debug)
     options.lock()