Handle SSH timeout in cloud-init polling loop

Under TCG on CI, cloud-init status can take longer than 15s to
respond while packages are installing. Catch TimeoutExpired and
retry instead of crashing the test. Also bumped the per-poll
timeout from 15s to 30s.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: pnc

tests/test_e2e.py

@@ -240,7 +240,12 @@ def test_cloud_init_success(running_vm):
     deadline = time.monotonic() + 300
     last_detail = ""
     while time.monotonic() < deadline:
-        r = _vm_ssh("cloud-init status --long 2>&1", timeout=15)
+        try:
+            r = _vm_ssh("cloud-init status --long 2>&1", timeout=30)
+        except subprocess.TimeoutExpired:
+            remaining = int(deadline - time.monotonic())
+            _progress(f"cloud-init ({remaining}s left): (SSH timed out, retrying)")
+            continue
         remaining = int(deadline - time.monotonic())
         # Compact multi-line status into a single progress line.
         detail = " | ".join(