Fix AWS_MSK_IAM configuration handling

[rtimush]

There seems to be a typo that breaks AWS_MSK_IAM authentication.

[weeco]

Hey @rtimush ,
good find! Unfortunately I never had the chance to actually test it. Do you have a chance to give it a shot and possibly report back whether it works?

[rtimush]

Hey @weeco. I tried quay.io/cloudhut/kowl:master-99480a7e and unfortunately it still didn't work for me with an Access denied: SASL_AUTHENTICATION_FAILED: SASL Authentication failed. error.

[twmb]

@rtimush how are you trying to access the cluster? from a local ec2 instance, or from your laptop? what is your IAM policy, as well? I know when I tested this, the default policies are kafka:*, but MSK wants kafka-cluster:*, which took a bit to find ...

[rtimush]

I indeed made a mistake in the resources section of the IAM policy. Everything works, thanks.