On-premises Key Vault will not resolve without period in suffix-keyvault-dns value

### Describe the bug

I am using az cli 2.53.1 in the official Microsoft container. If I try to do:

```shell
az keyvault secret set --name --vault-name --value=
```

Then, az cli is unable to resolve my hostname. I previously passed in via

```shell
az cloud register -n AzureStackUser --endpoint-resource-manager $METADATA_HOST --suffix-keyvault-dns $KEYVAULT_SUFFIX_DNS
```

My keyvault suffix dns. It was set to:

```shell
vault.
```

I could not figure out why AzCLI kept reporting that the name could not be resolved. I had to add a period in front of .vault since apparently AzCLI does not append a period.

I think AzCLI should append a period. This would make it consistent with how storage endpoint works. As far as I can tell, that does not require a period.

### Related command

see above

### Errors

Errno -2. Name could not be resolved.

### Issue script & Debug output

Not able to provide. Airgapped.

### Expected behavior

AzCLI does not require a period.

### Environment Summary

azure-cli 2.53.1
core 2.53.1
telemetry 1.10
Dependencies:

msal 1.24.0b2
azure-mgmt-resource 23.1.0b2

### Additional context

Using Azure Stack Hub