Lowercase OVS sample config section headers

The "Sample Configurations" section of ovs_neutron_plugin.ini
has uppercased section headers.  In Havana the section headers
were normalized to lowercase, but the sample configs were never
updated.

Change-Id: Ic33392788317adcd6eb86caeef4f25aa4a3d10c8
Closes-Bug: #1279418

Author: Mark T. Voelker

etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini

@@ -138,28 +138,28 @@
 #-----------------------------------------------------------------------------
 #
 # 1. With VLANs on eth1.
-# [OVS]
+# [ovs]
 # network_vlan_ranges = default:2000:3999
 # tunnel_id_ranges =
 # integration_bridge = br-int
 # bridge_mappings = default:br-eth1
 #
 # 2. With GRE tunneling.
-# [OVS]
+# [ovs]
 # network_vlan_ranges =
 # tunnel_id_ranges = 1:1000
 # integration_bridge = br-int
 # tunnel_bridge = br-tun
 # local_ip = 10.0.0.3
 #
 # 3. With VXLAN tunneling.
-# [OVS]
+# [ovs]
 # network_vlan_ranges =
 # tenant_network_type = vxlan
 # tunnel_type = vxlan
 # tunnel_id_ranges = 1:1000
 # integration_bridge = br-int
 # tunnel_bridge = br-tun
 # local_ip = 10.0.0.3
-# [AGENT]
+# [agent]
 # tunnel_types = vxlan