Add generic network interface management in the amphora

Handle network configuration using Octavia tools.

amphora-interface configures network interfaces inside the amphora
using pyroute2 and a set of json files for persistent configuration in
the /etc/octavia/interfaces/ directory.

Story: 2005235
Task: 30019

Depends-On: https://review.opendev.org/806558

Change-Id: I5360c8246cd39f90eb7104a883f87c0042d146c4

Author: gthiemonge

elements/amphora-agent/install.d/amphora-agent-source-install/75-amphora-agent-install

@@ -27,6 +27,9 @@ ln -s $AMP_VENV/bin/haproxy-vrrp-* /usr/local/bin/ || true
 # Link heath checker script
 ln -s $AMP_VENV/bin/amphora-health-checker /usr/local/bin/amphora-health-checker || true
 
+# Link amphora interface script
+ln -s $AMP_VENV/bin/amphora-interface /usr/local/bin/amphora-interface || true
+
 mkdir /etc/octavia
 # we assume certs, etc will come in through the config drive
 mkdir /etc/octavia/certs

etc/octavia.conf

@@ -457,7 +457,6 @@
 #
 # agent_server_network_dir =
 
-# agent_server_network_file =
 # agent_request_read_timeout = 180
 
 # Minimum TLS protocol, eg: TLS, TLSv1.1, TLSv1.2, TLSv1.3 (if available)

octavia/amphorae/backends/agent/agent_jinja_cfg.py

@@ -40,8 +40,6 @@ def build_agent_config(self, amphora_id, topology):
              'agent_server_cert': CONF.amphora_agent.agent_server_cert,
              'agent_server_network_dir':
                  CONF.amphora_agent.agent_server_network_dir,
-             'agent_server_network_file':
-                 CONF.amphora_agent.agent_server_network_file,
              'agent_request_read_timeout':
                  CONF.amphora_agent.agent_request_read_timeout,
              'amphora_id': amphora_id,

octavia/amphorae/backends/agent/api_server/loadbalancer.py

@@ -28,7 +28,6 @@
 from werkzeug import exceptions
 
 from octavia.amphorae.backends.agent.api_server import haproxy_compatibility
-from octavia.amphorae.backends.agent.api_server import osutils
 from octavia.amphorae.backends.agent.api_server import util
 from octavia.common import constants as consts
 from octavia.common import utils as octavia_utils
@@ -73,9 +72,6 @@ def __getattr__(self, attr):
 
 class Loadbalancer(object):
 
-    def __init__(self):
-        self._osutils = osutils.BaseOS.get_os_util()
-
     def get_haproxy_config(self, lb_id):
         """Gets the haproxy config
 
@@ -199,7 +195,6 @@ def upload_haproxy_config(self, amphora_id, lb_id):
                                       respawn_interval),
                     amphora_netns=consts.AMP_NETNS_SVC_PREFIX,
                     amphora_nsname=consts.AMPHORA_NAMESPACE,
-                    HasIFUPAll=self._osutils.has_ifup_all(),
                     haproxy_major_version=hap_major,
                     haproxy_minor_version=hap_minor
                 )