Metaplugin removal

Metaplugin is removed in Liberty[1].
Remove all metaplugin related codes.

[1]: https://review.openstack.org/#/c/192056/

Change-Id: I6c1b28e596ddb8ea4e218a455e3fa2b5e9ccc8c1
Closes-Bug: #1465132

doc/config-reference/networking/section_networking-plugins.xml

@@ -97,14 +97,6 @@
                            href="../../common/tables/neutron-linuxbridge_agent.xml"
                   />
          </section>
-         <section xml:id="networking-plugin-meta">
-                  <title>Meta Plug-in configuration options</title>
-                  <para>The Meta Plug-in allows you to use multiple
-                           plug-ins at the same time.</para>
-                  <xi:include
-                           href="../../common/tables/neutron-meta.xml"
-                  />
-         </section>
          <xi:include href="section_networking-plugins-ml2.xml"/>
          <section xml:id="networking-plugin-midonet">
                   <title>MidoNet configuration options</title>

tools/autogenerate-config-flagmappings/neutron.flagmappings

@@ -251,13 +251,6 @@ L3_BROCADE_MLX_EXAMPLE/physical_networks l3_brocade_mlx
 L3_BROCADE_MLX_EXAMPLE/ports l3_brocade_mlx
 L3_BROCADE_MLX_EXAMPLE/username l3_brocade_mlx
 LINUX_BRIDGE/physical_interface_mappings linuxbridge_agent
-META/default_flavor meta
-META/default_l3_flavor meta
-META/extension_map meta
-META/l3_plugin_list meta
-META/plugin_list meta
-META/rpc_flavor meta
-META/supported_extension_aliases meta
 MIDONET/client midonet
 MIDONET/cluster_ip midonet
 MIDONET/cluster_port midonet

tools/autogenerate-config-flagmappings/neutron.headers

@@ -23,7 +23,6 @@ lbaas_haproxy LBaaS HAProxy plugin
 lbaas_netscaler LBaaS NetScaler plugin
 lbaas_radware LBaaS Radware plugin
 linuxbridge_agent Linux Bridge agent
-meta meta
 metering_agent metering agent
 midonet Midonet
 ml2 ML2