Flaky tests `test_verb_load` `test_verb_list` can't create a daemon OSError Errno 99

Bug report

Required Info:

• Operating System:
  • Ubuntu Focal, x86 and arm64
• Installation type:
• Version or commit hash:
  • https://github.com/ros2/ros2cli/commit/a4daa7672f287997d1345a44ebb9e0c3d0c490b6 for sure
• DDS implementation:
  • default
• Client library (if applicable):
  • n/a

Steps to reproduce issue

???

Expected behavior

The tests would all pass

Actual behavior

They fail

Additional information

Jobs that have failed:

• https://ci.ros2.org/job/nightly_linux_release/1891
• https://ci.ros2.org/job/nightly_linux-aarch64_repeated/1569
• https://build.ros2.org/view/Rci/job/Rci__nightly-extra-rmw-release_ubuntu_focal_amd64/294

They all fail with OSError

FAIL: test_verb_list.TestVerbList.test_verb_list[rmw_fastrtps_cpp]
--------------------------------------------------------------------------------------------------------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/jenkins-agent/workspace/nightly_linux-aarch64_repeated/ws/src/ros2/ros2cli/ros2param/test/test_verb_list.py", line 123, in setUp
    with NodeStrategy(None) as node:
  File "/home/jenkins-agent/workspace/nightly_linux-aarch64_repeated/ws/install/ros2cli/lib/python3.8/site-packages/ros2cli/node/strategy.py", line 52, in __enter__
    self._daemon_node.__enter__()
  File "/home/jenkins-agent/workspace/nightly_linux-aarch64_repeated/ws/install/ros2cli/lib/python3.8/site-packages/ros2cli/node/daemon.py", line 116, in __enter__
    methods = self._proxy.system.listMethods()
  File "/usr/lib/python3.8/xmlrpc/client.py", line 1109, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python3.8/xmlrpc/client.py", line 1450, in __request
    response = self.__transport.request(
  File "/usr/lib/python3.8/xmlrpc/client.py", line 1153, in request
    return self.single_request(host, handler, request_body, verbose)
  File "/usr/lib/python3.8/xmlrpc/client.py", line 1165, in single_request
    http_conn = self.send_request(host, handler, request_body, verbose)
  File "/usr/lib/python3.8/xmlrpc/client.py", line 1278, in send_request
    self.send_content(connection, request_body)
  File "/usr/lib/python3.8/xmlrpc/client.py", line 1308, in send_content
    connection.endheaders(request_body)
  File "/usr/lib/python3.8/http/client.py", line 1250, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/lib/python3.8/http/client.py", line 1010, in _send_output
    self.send(msg)
  File "/usr/lib/python3.8/http/client.py", line 950, in send
    self.connect()
  File "/usr/lib/python3.8/http/client.py", line 921, in connect
    self.sock = self._create_connection(
  File "/usr/lib/python3.8/socket.py", line 808, in create_connection
    raise err
  File "/usr/lib/python3.8/socket.py", line 796, in create_connection
    sock.connect(sa)
OSError: [Errno 99] Cannot assign requested address

I suspect this is caused by https://github.com/ros2/ros2cli/pull/622, but I don’t know for sure.

[sloretz]

FYI future buildfarmers: This was fixed by #652, but it doesn’t seem to be backportable. These tests are still flaky in Galactic.

[hidmic]

It is. I haven’t had the time to circle back 😕. If it’s becoming increasingly painful, I’ll try to fit it as soon as I can, but anyone should feel free to pick it up as well.