Bug #887805 Error during report_driver_status(): 'LibvirtConnection' object has no attribute '_host_state'

Fixes the host status reports from LibvirtConnection driver.
This fix initializes in class 'LibvirtConnection', the local variable
'_host_state' and replaces the variable 'session' by the local
variable 'read_only'.

Change-Id: Ia3ba29dc287c793c79a2bbde0d5ec69eb6ada480

.mailmap

@@ -18,6 +18,7 @@
 <dan@nicira.com> <danwent@dan-xs3-cs>
 <dan@nicira.com> <danwent@gmail.com>
 <devin.carlen@gmail.com> <devcamcar@illian.local>
+<edouard1.thuleau@orange.com> <thuleau@gmail.com>
 <ewan.mellor@citrix.com> <emellor@silver>
 <itoumsn@nttdata.co.jp> <itoumsn@shayol>
 <jake@ansolabs.com> <jake@markupisart.com>

Authors

@@ -39,7 +39,7 @@ Devendra Modium <dmodium@isi.edu>
 Devin Carlen <devin.carlen@gmail.com>
 Donal Lafferty <donal.lafferty@citrix.com>
 Ed Leafe <ed@leafe.com>
-Edouard Thuleau <thuleau@gmail.com>
+Edouard Thuleau <edouard1.thuleau@orange.com>
 Eldar Nugaev <reldan@oscloud.ru>
 Eric Day <eday@oddments.org>
 Eric Windisch <eric@cloudscaling.com>

nova/virt/libvirt/connection.py

@@ -195,11 +195,12 @@ class LibvirtConnection(driver.ComputeDriver):
             driver_type, _sep, driver = driver_str.partition('=')
             driver_class = utils.import_class(driver)
             self.volume_drivers[driver_type] = driver_class(self)
+        self._host_state = None
 
     @property
     def host_state(self):
         if not self._host_state:
-            self._host_state = HostState(self._session)
+            self._host_state = HostState(self.read_only)
         return self._host_state
 
     def init_host(self, host):