Add foreman.target lifecycle tests (stop/start and restart)

Extends foreman_target_test.py with lifecycle tests intended to run
at the end of the test suite. Tests that foreman.target can be cleanly
stopped and restarted, and that Foreman becomes available again
afterwards via the HTTPS endpoint (same curl pattern as
test_https_foreman_ping in httpd_test.py).

Author: pablomh

tests/target_lifecycle_test.py

@@ -0,0 +1,36 @@
+import time
+
+FOREMAN_PING_RETRIES = 60
+FOREMAN_PING_DELAY = 10
+CURL_CMD = "curl --silent --output /dev/null"
+
+
+def _wait_for_foreman(server, server_fqdn, certificates):
+    """Poll the Foreman HTTPS frontend until available or timeout."""
+    for _ in range(FOREMAN_PING_RETRIES):
+        cmd = server.run(
+            f"{CURL_CMD} --cacert {certificates['ca_certificate']}"
+            f" --write-out '%{{http_code}}' https://{server_fqdn}/api/v2/ping"
+        )
+        if cmd.stdout == '200':
+            return
+        time.sleep(FOREMAN_PING_DELAY)
+    raise AssertionError("Foreman did not become available after target lifecycle operation")
+
+
+def test_foreman_target_stop_start(server, server_fqdn, certificates):
+    result = server.run("systemctl stop foreman.target")
+    assert result.rc == 0, f"Failed to stop foreman.target: {result.stderr}"
+    assert not server.service("foreman.target").is_running
+
+    result = server.run("systemctl start foreman.target")
+    assert result.rc == 0, f"Failed to start foreman.target: {result.stderr}"
+    _wait_for_foreman(server, server_fqdn, certificates)
+    assert server.service("foreman.target").is_running
+
+
+def test_foreman_target_restart(server, server_fqdn, certificates):
+    result = server.run("systemctl restart foreman.target")
+    assert result.rc == 0, f"Failed to restart foreman.target: {result.stderr}"
+    _wait_for_foreman(server, server_fqdn, certificates)
+    assert server.service("foreman.target").is_running