Fix typo in Newton configuration

Change-Id: I1eaff101849c1ca09613df063f9b1190fbe4237d
diff --git a/ceilometer/files/newton/ceilometer-agent.conf.Debian b/ceilometer/files/newton/ceilometer-agent.conf.Debian
index df0d8e2..3c8df67 100644
--- a/ceilometer/files/newton/ceilometer-agent.conf.Debian
+++ b/ceilometer/files/newton/ceilometer-agent.conf.Debian
@@ -978,7 +978,7 @@
 project_name = {{ agent.identity.tenant }}
 username = {{ agent.identity.user }}
 password = {{ agent.identity.password }}
-auth_uri=http://{{ agent.identity.host }}:5000/v3
+auth_url=http://{{ agent.identity.host }}:5000/v3
 token_cache_time = -1
 interface=internalURL
 region_name={{ agent.get('region', 'RegionOne') }}
\ No newline at end of file