[log]: Devstack plugin for logging api

This patch implements devstack plugin for logging api. The logging
api service base on logging api spec [1].

[1] https://specs.openstack.org/openstack/neutron-specs/specs/pike/logging-API-for-security-group-rules.html

Change-Id: Ib86535ad24319cb0e10a48df50651264201673c3
Depends-On: Ib8668dd25ee7c5000a6dafcc7db3dbc33ad190be
Partially-implements: blueprint security-group-logging
Related-Bug: #1468366

devstack/lib/log

@@ -0,0 +1,12 @@
+function configure_log_service_plugin {
+    neutron_service_plugin_class_add "log"
+}
+
+function configure_log_extension {
+    plugin_agent_add_l2_agent_extension "log"
+}
+
+function configure_log {
+    configure_log_service_plugin
+    configure_log_extension
+}

devstack/plugin.sh

@@ -9,6 +9,7 @@ source $LIBDIR/qos
 source $LIBDIR/ovs
 source $LIBDIR/segments
 source $LIBDIR/trunk
+source $LIBDIR/log
 
 Q_BUILD_OVS_FROM_GIT=$(trueorfalse False Q_BUILD_OVS_FROM_GIT)
 
@@ -36,6 +37,9 @@ if [[ "$1" == "stack" ]]; then
             if is_service_enabled q-trunk neutron-trunk; then
                 configure_trunk_extension
             fi
+            if is_service_enabled q-log neutron-log; then
+                configure_log
+            fi
             if is_service_enabled q-dns neutron-dns; then
                 configure_dns_extension
                 post_config_dns_extension

neutron/tests/contrib/gate_hook.sh

@@ -96,6 +96,7 @@ case $VENV in
     fi
     load_conf_hook quotas
     load_rc_hook dns
+    load_rc_hook log
     load_rc_hook qos
     load_rc_hook segments
     load_rc_hook trunk

neutron/tests/contrib/hooks/api_all_extensions

@@ -18,6 +18,7 @@ NETWORK_API_EXTENSIONS+=",flavors"
 NETWORK_API_EXTENSIONS+=",l3-flavors"
 NETWORK_API_EXTENSIONS+=",l3-ha"
 NETWORK_API_EXTENSIONS+=",l3_agent_scheduler"
+NETWORK_API_EXTENSIONS+=",logging"
 NETWORK_API_EXTENSIONS+=",metering"
 NETWORK_API_EXTENSIONS+=",multi-provider"
 NETWORK_API_EXTENSIONS+=",net-mtu"

neutron/tests/contrib/hooks/log

@@ -0,0 +1,6 @@
+enable_service neutron-log
+
+[[post-config|/$NEUTRON_CORE_PLUGIN_CONF]]
+
+[network_log]
+local_output_log_base = /tmp/test_log.log