crate / croud / 727

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master: 95%

Pull #264

travis-ci

Always use API region from config to make API calls

This commit changes the way how the `--region` argument is used for API
calls. Where previously this argument temporarily overwrote the `region`
setting from the configuration to invoke HTTP requests on the specified
region specific subdomain of `cratedb[-dev].cloud`, API requests are now
always invoked on the region specified in the configuration. However,
the HTTP request header `X-Region` is set to the value specified using
the `--region` argument, or if not present, to the value of the region
configuration setting.
This is however not the case for the `croud config set` command! This
command still sets the configuration value.

```
croud config set --region eastus2.azure --env prod

croud clusters list
\# uses the API endpoint at https://eastus2.azure.cratedb.cloud/
\# sets the X-Region header to "eastus2.azure"
\# lists all clusters of the region eastus2.azure

croud clusters list --region westeurope.azure
\# still uses the API endpoint at https://eastus2.azure.cratedb.cloud/
\# sets the X-Region header to "westeurope.azure"
\# lists all clusters of the region westeurope.azure
```

*This change requires a CrateDB Cloud version that implements the
functionality of the `X-Region` HTTP header.*

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