Refactoring config options for plugin macvtap opts

Refactoring neutron ml2 plugin macvtap driver config opts to be in
neutron/conf/plugins/ml2/drivers/macvtap so that all the
configuration options for macvtap drivers reside in a centralized
location. This simplifies the process of looking up the macvtap driver
config opts and provides an easy way to import.

Change-Id: I1768eefb9eadcea19bcb675cbd96a6cb728b4123
Partial-Bug: #1563069

neutron/conf/plugins/ml2/drivers/macvtap.py

@@ -34,4 +34,5 @@ macvtap_opts = [
 ]
 
 
-cfg.CONF.register_opts(macvtap_opts, "macvtap")
+def register_macvtap_opts(cfg=cfg.CONF):
+    cfg.register_opts(macvtap_opts, "macvtap")

neutron/opts.py

@@ -35,6 +35,7 @@ import neutron.conf.extensions.allowedaddresspairs
 import neutron.conf.plugins.ml2.drivers.agent
 import neutron.conf.plugins.ml2.drivers.driver_type
 import neutron.conf.plugins.ml2.drivers.linuxbridge
+import neutron.conf.plugins.ml2.drivers.macvtap
 import neutron.conf.quota
 import neutron.conf.service
 import neutron.conf.services.metering_agent
@@ -52,7 +53,6 @@ import neutron.db.migration.cli
 import neutron.extensions.l3
 import neutron.extensions.securitygroup
 import neutron.plugins.ml2.config
-import neutron.plugins.ml2.drivers.macvtap.agent.config
 import neutron.plugins.ml2.drivers.mech_sriov.agent.common.config
 import neutron.plugins.ml2.drivers.openvswitch.agent.common.config
 import neutron.wsgi
@@ -206,7 +206,7 @@ def list_l3_agent_opts():
 def list_macvtap_opts():
     return [
         ('macvtap',
-         neutron.plugins.ml2.drivers.macvtap.agent.config.macvtap_opts),
+         neutron.conf.plugins.ml2.drivers.macvtap.macvtap_opts),
         ('agent',
          neutron.conf.plugins.ml2.drivers.agent.agent_opts),
         ('securitygroup',

neutron/plugins/ml2/drivers/macvtap/agent/macvtap_neutron_agent.py

@@ -29,10 +29,10 @@ from neutron.agent.linux import ip_lib
 from neutron.api.rpc.handlers import securitygroups_rpc as sg_rpc
 from neutron.common import config as common_config
 from neutron.common import topics
+from neutron.conf.plugins.ml2.drivers import macvtap as config
 from neutron.plugins.common import constants as p_constants
 from neutron.plugins.ml2.drivers.agent import _agent_manager_base as amb
 from neutron.plugins.ml2.drivers.agent import _common_agent as ca
-from neutron.plugins.ml2.drivers.macvtap.agent import config  # noqa
 from neutron.plugins.ml2.drivers.macvtap import macvtap_common
 
 LOG = logging.getLogger(__name__)
@@ -41,6 +41,8 @@ MACVTAP_AGENT_BINARY = "neutron-macvtap-agent"
 MACVTAP_FS = "/sys/class/net/"
 EXTENSION_DRIVER_TYPE = 'macvtap'
 
+config.register_macvtap_opts()
+
 
 class MacvtapRPCCallBack(sg_rpc.SecurityGroupAgentRpcCallbackMixin,
                          amb.CommonAgentManagerRpcCallBackBase):