dial-timeout option does not take effect on the watch command.

[chengjoey]

Bug report criteria

• This bug report is not security related, security issues should be disclosed privately via etcd maintainers.
• This is not a support request or question, support requests or questions should be raised in the etcd discussion forums.
• You have read the etcd bug reporting guidelines.
• Existing open issues along with etcd frequently asked questions have been checked and this is not a duplicate.

What happened?

ETCDCTL_API=3 etcdctl --dial-timeout=2s --endpoints=localhost:2379 watch /foo

I don't have etcd-server running locally, and I have specified dial-timeout as 2s,but etcdctl keep stuck, which makes people wonder if the connection is successful but the data is not updated.

What did you expect to happen?

If the specified dial-timeout is exceeded and the endpoints cannot be connected, an error is returned.

How can we reproduce it (as minimally and precisely as possible)?

the endpoint targets are not running etcd-server, and running follow command:

ETCDCTL_API=3 etcdctl --dial-timeout=2s --endpoints=localhost:2379 watch /foo

Anything else we need to know?

get command working well

Etcd version (please run commands below)

$ etcd --version
# paste output here

$ etcdctl version
# 3.5.12

Etcd configuration (command line flags or environment variables)

paste your configuration here

Etcd debug information (please run commands below, feel free to obfuscate the IP address or FQDN in the output)

$ etcdctl member list -w table
# paste output here

$ etcdctl --endpoints=<member list> endpoint status -w table
# paste output here

Relevant log output

No response

[chengjoey]

/assign