### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

Starting localstack with the CLI `PROVIDER_OVERRIDE_SQS=asf bin/localstack --debug start` starts up correctly but then uses the `default` SQS provider.

### Expected Behavior

I would expect it to start the asf provider.

### How are you starting LocalStack?

With the `localstack` script

### Steps To Reproduce

* `PROVIDER_OVERRIDE_SQS=asf bin/localstack --debug start`
* `awslocal sqs create-queue --queue-name "test-queue"`

logs show:

```
2021-12-27T14:08:43.274:DEBUG:plugin.manager: instantiating plugin PluginSpec(localstack.aws.provider.sqs:default = <function sqs at 0x7f30e6d2b820>)
2021-12-27T14:08:43.274:DEBUG:plugin.manager: loading plugin localstack.aws.provider:sqs:default
2021-12-27T14:08:43.278:INFO:localstack.services.infra: Starting mock SQS service on http port 4566 ...
2021-12-27T14:08:43.279:INFO:localstack.services.infra: Starting mock SQS service on http port 4566 ...
2021-12-27T14:08:43.279:INFO:localstack.services.motoserver: starting moto server on http://0.0.0.0:38335
```

### Environment

```markdown
- OS: Ubuntu 20.04
- LocalStack: 13.2
```


### Anything else?

_No response_
TRUE_STRINGS,
)
load_start_time = time.time()
class Directories:
    """
    Holds the different directories available to localstack. Some directories are shared between the host and the
    localstack container, some live only on the host and some only in the container.
    Attributes:
        static_libs: container only; binaries and libraries statically packaged with the image
        var_libs:    shared; binaries and libraries+data computed at runtime: lazy-loaded binaries, ssl cert, ...
        cache:       shared; ephemeral data that has to persist across localstack runs and reboots
        tmp:         shared; ephemeral data that has to persist across localstack runs but not reboots
        functions:   shared; volume to communicate between host<->lambda containers
        data:        shared; holds localstack state, pods, ...
        config:      host only; pre-defined configuration values, cached credentials, machine id, ...
        init:        shared; user-defined provisioning scripts executed in the container when it starts
        logs:        shared; log files produced by localstack
    """
    static_libs: str
    var_libs: str
    cache: str
    tmp: str
    functions: str
    data: str
    config: str
    init: str
    logs: str
    
    default_bind_mounts = ["var_libs", "cache", "tmp", "data", "init", "logs"]
    def __init__(