`wasme deploy istio` usage message is wrong for multiple arguments

[jameshbarton]

Describe the bug
The usage message for wasme deploy istio is wrong for both the --namespaces and --name options.

To Reproduce

1. Run this command and observe that --namespaces is identified as an unknown flag even though it is listed as an optional argument [--namespaces <comma separated namespaced] in the usage message.

% wasme deploy istio webassemblyhub.io/jameshbarton/remove-headers:v1.0 --id=remove-headers --config "x-envoy" --namespaces istio-system --name istio-ingressgateway
Error: unknown flag: --namespaces
Usage:
  wasme deploy istio <image> --id=<unique name> [--config=<inline string>] [--root-id=<root id>] [--namespaces <comma separated namespaces>] [--name deployment-name] [--patch-context={any|inbound|outbound|gateway}] [flags]

Flags:
      --cache-custom-command strings     custom command to provide to the cache server image
      --cache-image-pull-policy string   image pull policy for the cache server daemonset. see https://kubernetes.io/docs/concepts/containers/images/ (default "IfNotPresent")
      --cache-name string                name of resources for the wasm image cache server (default "wasme-cache")
      --cache-namespace string           namespace of resources for the wasm image cache server (default "wasme")
      --cache-repo string                name of the image repository to use for the cache server daemonset (default "quay.io/solo-io/wasme")
      --cache-tag string                 image tag to use for the cache server daemonset (default "0.0.33")
      --cache-timeout duration           the length of time to wait for the server-side filter cache to pull the filter image before giving up with an error. set to 0 to skip the check entirely (note, this may produce a known race condition). (default 1m0s)
  -h, --help                             help for istio
      --ignore-version-check             set to disable abi version compatability check.
      --istio-namespace string           the namespace where the Istio control plane is installed (default "istio-system")
      --istiod-name string               deployment name of the istiod (default "istiod")
  -l, --labels stringToString            labels of the deployment or daemonset into which to inject the filter. if not set, will apply to all workloads in the target namespace (default [])
  -n, --namespace string                 namespace of the workload(s) to inject the filter. (default "default")
      --patch-context string             patch context of the filter. possible values are any, inbound, outbound, gateway (default "inbound")
  -t, --workload-type string             type of workload into which the filter should be injected. possible values are daemonset, deployment, statefulset (default "deployment")

Global Flags:
      --config string    optional config that will be passed to the filter. accepts an inline string.
      --id string        unique id for naming the deployed filter. this is used for logging as well as removing the filter. when running wasme deploy istio, this name must be a valid Kubernetes resource name.
      --root-id string   optional root ID used to bind the filter at the Envoy level. this value is normally read from the filter image directly.
  -v, --verbose          verbose output

2. Change --namespaces to --namespace and rerun. Note that --name is identified as an unknown flag even though it is listed as an optional argument [--name deployment-name] in the usage message.

% wasme deploy istio webassemblyhub.io/jameshbarton/remove-headers:v1.0 --id=remove-headers --config "x-envoy" --namespace istio-system --name istio-ingressgateway
Error: unknown flag: --name
Usage:
  wasme deploy istio <image> --id=<unique name> [--config=<inline string>] [--root-id=<root id>] [--namespaces <comma separated namespaces>] [--name deployment-name] [--patch-context={any|inbound|outbound|gateway}] [flags]
...

Expected behavior
Usage message should accurately reflect CLI arguments.

Additional context

% wasme --version
wasme version 0.0.33

[swartz-k]

Hey, I cannot reproduce this problem. --name is not supported，only use --namespace didnt get error

[jameshbarton]

@swartz-k - I was able to reproduce just now. This issue isn't about whether we can get wasme deploy istio to work; it's about correcting multiple confusing errors in the usage message.

In the first example above, I used the option --namespaces. The usage message says that that is an unknown flag, but the following line says that it's an optional argument [--namespaces <comma separated namespaces>]:
wasme deploy istio <image> --id=<unique name> [--config=<inline string>] [--root-id=<root id>] [--namespaces <comma separated namespaces>] [--name deployment-name] [--patch-context={any|inbound|outbound|gateway}] [flags]

In the second example, I used the option --name. Your comment says that --name is not supported, but the usage message clearly says that it is supported as an optional argument:
wasme deploy istio <image> --id=<unique name> [--config=<inline string>] [--root-id=<root id>] [--namespaces <comma separated namespaces>] [--name deployment-name] [--patch-context={any|inbound|outbound|gateway}] [flags]

The usage message should accurately reflect the acceptable CLI arguments.

[swartz-k]

@jameshbarton Thanks. I got that and found code about this logic. I will make pr to fix problems like this.