Add events to kubectl.wait() and kubectl.rollout() errors

Most errors are timeouts, and the error from kubectl is not helpful:

    error: timed out waiting for the condition on deployments/nginx

Try to add events from the relevant resource to help debugging the
issue.

Here is an example when running a self test in a loop, reaching Docker
Hub rate limit:

    drenv.commands.Error: Command failed:
       command: ('kubectl', 'wait', '--context', 'dr1', 'deploy/nginx', '--for=condition=Available',
                 '--namespace=ns1', '--timeout=120s')
       exitcode: 1
       error:
          error: timed out waiting for the condition on deployments/nginx
       events:
          LAST SEEN              TYPE      REASON    OBJECT                       MESSAGE
          36m (x27 over 151m)    Warning   Failed    Pod/nginx-7f456874f4-kqljw   Failed to pull
          image "nginx": rpc error: code = Unknown desc = failed to pull and unpack image
              "docker.io/library/nginx:latest": ...: 429 Too Many Requests - Server message:
              toomanyrequests: You have reached your pull rate limit. You may increase the limit by
              authenticating and upgrading: https://www.docker.com/increase-rate-limit
          26m (x29 over 151m)    Normal    Pulling   Pod/nginx-7f456874f4-kqljw   Pulling image "nginx"
          85s (x648 over 151m)   Normal    BackOff   Pod/nginx-7f456874f4-kqljw   Back-off pulling image "nginx"

Signed-off-by: Nir Soffer <nsoffer@redhat.com>

test/drenv/kubectl.py

@@ -93,7 +93,13 @@ def rollout(action, resource, timeout=300, namespace=None, context=None, log=pri
     args = [action, resource, f"--timeout={timeout}s"]
     if namespace:
         args.append(f"--namespace={namespace}")
-    _watch("rollout", *args, context=context, log=log)
+    try:
+        _watch("rollout", *args, context=context, log=log)
+    except commands.Error as e:
+        # Most failures are timeouts, events may help to debug.
+        if action == "status":
+            e.events = _try_events(resource, namespace=namespace, context=context)
+        raise
 
 
 def wait(
@@ -123,7 +129,21 @@ def wait(
         args.append(f"--for={condition}")
     if namespace:
         args.append(f"--namespace={namespace}")
-    _watch("wait", *args, context=context, log=log)
+
+    try:
+        _watch("wait", *args, context=context, log=log)
+    except commands.Error as e:
+        # Most failures are timeouts, events may help to debug.
+        if resource and not (all or selector):
+            e.events = _try_events(resource, namespace=namespace, context=context)
+        raise
+
+
+def _try_events(resource, namespace=None, context=None):
+    try:
+        return events(resource, namespace=namespace, context=context)
+    except Exception as e:
+        return f"(error getting events: {e})"
 
 
 def _run(cmd, *args, context=None):