Fix Mellanox CI, test-requirements.txt and unit tests failures

Due to some upstream changes [1], Mellanox CI is failing.
Moreover, the test requierments must be synced with the neutron
[1]  [openstack/neutron@b5e10bf

Change-Id: Ie54d2b5d535d815019e6546b0ee8478633f684f0

Author: wmousa

networking_mlnx/eswitchd/eswitch_daemon.py

@@ -16,6 +16,7 @@
 
 import sys
 
+from neutron.common import config as common_config
 from oslo_config import cfg
 from oslo_log import log as logging
 from oslo_serialization import jsonutils
@@ -104,6 +105,7 @@ def daemon_loop(self):
 
 
 def main():
+    common_config.register_common_config_options()
     config.init(sys.argv[1:])
     try:
         daemon = MlxEswitchDaemon()

networking_mlnx/plugins/ml2/drivers/mlnx/agent/mlnx_eswitch_neutron_agent.py

@@ -455,6 +455,7 @@ def run(self):
 
 
 def main():
+    common_config.register_common_config_options()
     config.config.register_root_helper(cfg.CONF)
     common_config.init(sys.argv[1:])
     common_config.setup_logging()

networking_mlnx/tests/unit/ml2/drivers/mlnx/test_mech_mlnx.py

@@ -44,16 +44,20 @@ class MlnxMechanismBaseTestCase(base.AgentMechanismBaseTestCase):
 
     AGENTS = [{'alive': True,
                'configurations': GOOD_CONFIGS,
-               'host': 'host'}]
+               'host': 'host',
+               'agent_type': AGENT_TYPE}]
     AGENTS_DEAD = [{'alive': False,
                     'configurations': GOOD_CONFIGS,
-                    'host': 'dead_host'}]
+                    'host': 'dead_host',
+                    'agent_type': AGENT_TYPE}]
     AGENTS_BAD = [{'alive': False,
                    'configurations': GOOD_CONFIGS,
-                   'host': 'bad_host_1'},
+                   'host': 'bad_host_1',
+                   'agent_type': AGENT_TYPE},
                   {'alive': True,
                    'configurations': BAD_CONFIGS,
-                   'host': 'bad_host_2'}]
+                   'host': 'bad_host_2',
+                   'agent_type': AGENT_TYPE}]
 
     def setUp(self):
         super(MlnxMechanismBaseTestCase, self).setUp()

test-requirements.txt

@@ -10,10 +10,7 @@ testscenarios>=0.4 # Apache-2.0/BSD
 WebTest>=2.0.27 # MIT
 oslotest>=3.2.0 # Apache-2.0
 stestr>=1.0.0 # Apache-2.0
-reno>=3.1.0 # Apache-2.0
 ddt>=1.0.1 # MIT
-astroid==2.4.0 # LGPLv2.1
-isort==4.3.21 # MIT
 # Needed to run DB commands in virtualenvs
 PyMySQL>=0.7.6 # MIT License
 mock>=1.2