# Type of request: This is a ...

[x] bug report
[ ] feature request

# Detailed description

Calls to `DescribeStreamConsumer` for the Kinesis service do not return the registered consumer. Calls to `ListStreamConsumers` does correctly show registered consumers.

Filing this issue to document this bug. It looks like `kinesis_listener.py` has mixed naming of `StreamARN` and `StreamArn`, I'll create a PR to fix this evening.

## Expected behavior

Returns registered consumer when queried by stream ARN + consumer name, and stream ARN+ consumer ARN.

## Actual behavior

The returned error is HTTP 400, "Consumer <consumer_name/arn> not found."

# Steps to reproduce

## Command used to start LocalStack

```
SERVICES=kinesis docker-compose up
```
## Client code (AWS SDK code snippet, or sequence of "awslocal" commands)

```
# Setup a stream and register a consumer
awslocal kinesis create-stream --stream-name "test-stream" --shard-count 1
STREAM_ARN=$(awslocal kinesis describe-stream \
    --stream-name "test-stream" \
    --query StreamDescription.StreamARN \
    --output text)
awslocal kinesis register-stream-consumer \
    --stream-arn "$STREAM_ARN" \
    --consumer-name "test-consumer"

# Call by consumer name fails:
awslocal kinesis describe-stream-consumer \
  --stream-arn "$STREAM_ARN" \
  --consumer-name "test-consumer"

# Call by consumer ARN also fails:
awslocal kinesis describe-stream-consumer \
  --stream-arn "$STREAM_ARN" \
  --consumer-arn "$STREAM_ARN/consumer/test-consumer"
```

import re
import json
import time
import base64
import random
import cbor2
from requests.models import Response
from localstack import config
from localstack.constants import APPLICATION_JSON, APPLICATION_CBOR
from localstack.utils.aws import aws_stack
from localstack.utils.common import to_str, json_safe, clone, epoch_timestamp, now_utc
from localstack.utils.analytics import event_publisher
from localstack.services.awslambda import lambda_api
from localstack.services.generic_proxy import ProxyListener
from localstack.utils.aws.aws_responses import convert_to_binary_event_payload
ACTION_PREFIX = 'Kinesis_20131202'
ACTION_PUT_RECORD = '%s.PutRecord' % ACTION_PREFIX
ACTION_PUT_RECORDS = '%s.PutRecords' % ACTION_PREFIX
ACTION_LIST_STREAMS = '%s.ListStreams' % ACTION_PREFIX
STREAM_CONSUMERS = []
class ProxyListenerKinesis(ProxyListener):
    def forward_request(self, method, path, data, headers):