ccloud_lib.py throws error if there is a new line in the librdkafka.config file

https://github.com/confluentinc/examples/tree/5.5.0-post/clients/cloud/python
As per the docs, the config file should look like:

```
# Kafka
bootstrap.servers={{ BROKER_ENDPOINT }}
security.protocol=SASL_SSL
sasl.mechanisms=PLAIN
sasl.username={{ CLUSTER_API_KEY }}
sasl.password={{ CLUSTER_API_SECRET }}

# Confluent Cloud Schema Registry
schema.registry.url=https://{{ SR_ENDPOINT }}
basic.auth.credentials.source=USER_INFO
schema.registry.basic.auth.user.info={{ SR_API_KEY }}:{{ SR_API_SECRET }}
```

During runtime, ccloud_lib throws:

```
Traceback (most recent call last):
File "./consumer_ccsr.py", line 39, in
conf = ccloud_lib.read_ccloud_config(config_file)
File "/Users/jtsmith/confluent/examples/clients/cloud/python/ccloud_lib.py", line 130, in read_ccloud_config
if line[0] != "#" and len(line) != 0:
IndexError: string index out of range
```

Upon removing the newline between `sasl.password...` and `# Confluent Cloud...` it works as expected.

It might be easier to update https://github.com/confluentinc/configuration-templates/blob/master/clients/cloud/librdkafka-sr.config than the code, but that's just my opinion! Leaving it up to the experts to decide.