Add VERSION to ZTE driver class

This was the only remaining class that did not define a VERSION
constant. No versioning information is tracked within the driver,
so starting at version 1.0.0.

Change-Id: Idb1a559116787d6befc17cc080d56673df6ce17b

cinder/volume/drivers/zte/zte_ks.py

@@ -85,6 +85,8 @@ CONF.register_opts(zte_opts)
 
 class ZTEVolumeDriver(driver.VolumeDriver):
 
+    VERSION = "1.0.0"
+
     def __init__(self, *args, **kwargs):
         super(ZTEVolumeDriver, self).__init__(*args, **kwargs)
         self.configuration.append_config_values(zte_opts)