TUN-7360: Add Get Host Details handler in management service

With the management tunnels work, we allow calls to our edge service
   using an access JWT provided by Tunnelstore. Given a connector ID,
   this request is then proxied to the appropriate Cloudflare Tunnel.

   This PR takes advantage of this flow and adds a new host_details
   endpoint. Calls to this endpoint will result in cloudflared gathering
   some details about the host: hostname (os.hostname()) and ip address
   (localAddr in a dial).

   Note that the mini spec lists 4 alternatives and this picks alternative
   3 because:

   1. Ease of implementation: This is quick and non-intrusive to any of our
      code path. We expect to change how connection tracking works and
      regardless of the direction we take, it may be easy to keep, morph
      or throw this away.

   2. The cloudflared part of this round trip takes some time with a
      hostname call and a dial. But note that this is off the critical path
      and not an API that will be exercised often.

component-tests/util.py

@@ -9,6 +9,7 @@ import pytest
 
 import requests
 import yaml
+import json
 from retrying import retry
 
 from constants import METRICS_PORT, MAX_RETRIES, BACKOFF_SECS
@@ -48,7 +49,6 @@ def start_cloudflared(directory, config, cfd_args=["run"], cfd_pre_args=["tunnel
     # By setting check=True, it will raise an exception if the process exits with non-zero exit code
     return subprocess.run(cmd, check=expect_success, capture_output=capture_output)
 
-
 def cloudflared_cmd(config, config_path, cfd_args, cfd_pre_args, root):
     cmd = []
     if root:
@@ -106,13 +106,14 @@ def inner_wait_tunnel_ready(tunnel_url=None, require_min_connections=1):
     with requests.Session() as s:
         resp = send_request(s, metrics_url, True)
 
-        assert resp.json()["readyConnections"] >= require_min_connections, \
+        ready_connections = resp.json()["readyConnections"]
+
+        assert ready_connections >= require_min_connections, \
             f"Ready endpoint returned {resp.json()} but we expect at least {require_min_connections} connections"
 
         if tunnel_url is not None:
             send_request(s, tunnel_url, True)
 
-
 def _log_cloudflared_logs(cfd_logs):
     log_file = cfd_logs
     if os.path.isdir(cfd_logs):