Remove test duplications between tempest and n-t-p plugin

ExtraDHCPOptionsIpV6TestJSON and ExtraDHCPOptionsTestJSON -
https://opendev.org/openstack/tempest/src/branch/master/tempest/\
api/network/test_dhcp_ipv6.py has same functionality in tempest
and neutron-tempest-plugin, so with removing these tests from
neutron-tempest-plugin we can get rid of whole module, reducing
the test duplications.

Change-Id: I111eeba5c29cd7d703e6663be12e8e7e7659919e
diff --git a/neutron_tempest_plugin/api/test_extra_dhcp_options.py b/neutron_tempest_plugin/api/test_extra_dhcp_options.py
deleted file mode 100644
index 91c270d..0000000
--- a/neutron_tempest_plugin/api/test_extra_dhcp_options.py
+++ /dev/null
@@ -1,106 +0,0 @@
-# Copyright 2013 OpenStack Foundation
-# All Rights Reserved.
-#
-#    Licensed under the Apache License, Version 2.0 (the "License"); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
-#
-#         http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
-
-from neutron_lib import constants
-from tempest.lib.common.utils import data_utils
-from tempest.lib import decorators
-
-from neutron_tempest_plugin.api import base
-
-
-class ExtraDHCPOptionsTestJSON(base.BaseNetworkTest):
-    """Test Extra DHCP Options
-
-    Tests the following operations with the Extra DHCP Options Neutron API
-    extension:
-
-        port create
-        port list
-        port show
-        port update
-
-    v2.0 of the Neutron API is assumed. It is also assumed that the Extra
-    DHCP Options extension is enabled in the [network-feature-enabled]
-    section of etc/tempest.conf
-    """
-
-    required_extensions = ['extra_dhcp_opt']
-
-    @classmethod
-    def resource_setup(cls):
-        super(ExtraDHCPOptionsTestJSON, cls).resource_setup()
-        cls.network = cls.create_network()
-        cls.subnet = cls.create_subnet(cls.network)
-        cls.port = cls.create_port(cls.network)
-        cls.ip_tftp = ('123.123.123.123' if cls._ip_version == 4
-                       else '2015::dead')
-        cls.ip_server = ('123.123.123.45' if cls._ip_version == 4
-                         else '2015::badd')
-        cls.extra_dhcp_opts = [
-            {'opt_value': 'pxelinux.0',
-             'opt_name': 'bootfile-name'},  # default ip_version is 4
-            {'opt_value': cls.ip_tftp,
-             'opt_name': 'tftp-server',
-             'ip_version': cls._ip_version},
-            {'opt_value': cls.ip_server,
-             'opt_name': 'server-ip-address',
-             'ip_version': cls._ip_version}
-        ]
-
-    @decorators.idempotent_id('d2c17063-3767-4a24-be4f-a23dbfa133c9')
-    def test_create_list_port_with_extra_dhcp_options(self):
-        # Create a port with Extra DHCP Options
-        body = self.create_port(
-            self.network,
-            extra_dhcp_opts=self.extra_dhcp_opts)
-        port_id = body['id']
-
-        # Confirm port created has Extra DHCP Options
-        body = self.client.list_ports()
-        ports = body['ports']
-        port = [p for p in ports if p['id'] == port_id]
-        self.assertTrue(port)
-        self._confirm_extra_dhcp_options(port[0], self.extra_dhcp_opts)
-
-    @decorators.idempotent_id('9a6aebf4-86ee-4f47-b07a-7f7232c55607')
-    def test_update_show_port_with_extra_dhcp_options(self):
-        # Update port with extra dhcp options
-        name = data_utils.rand_name('new-port-name')
-        body = self.client.update_port(
-            self.port['id'],
-            name=name,
-            extra_dhcp_opts=self.extra_dhcp_opts)
-        # Confirm extra dhcp options were added to the port
-        body = self.client.show_port(self.port['id'])
-        self._confirm_extra_dhcp_options(body['port'], self.extra_dhcp_opts)
-
-    def _confirm_extra_dhcp_options(self, port, extra_dhcp_opts):
-        retrieved = port['extra_dhcp_opts']
-        self.assertEqual(len(retrieved), len(extra_dhcp_opts))
-        for retrieved_option in retrieved:
-            for option in extra_dhcp_opts:
-                # default ip_version is 4
-                ip_version = option.get('ip_version', constants.IP_VERSION_4)
-                if (retrieved_option['opt_value'] == option['opt_value'] and
-                    retrieved_option['opt_name'] == option['opt_name'] and
-                    retrieved_option['ip_version'] == ip_version):
-                    break
-            else:
-                self.fail('Extra DHCP option not found in port %s' %
-                          str(retrieved_option))
-
-
-class ExtraDHCPOptionsIpV6TestJSON(ExtraDHCPOptionsTestJSON):
-    _ip_version = 6