Scala Stream Collector: update AWS credentials to support iam/env/default not cpf

[alexanderdean]

No description provided.

[fblundun]

@alexanderdean - am I right in thinking that this means completely removing support for reading creds from a file on the classpath as described here?

[alexanderdean]

@fblundun - this is an old ticket, but I believe the intent is to harmonize the SSC with the ES Sink.

SSC options:

      # The following are used to authenticate for the Amazon Kinesis sink.
      #
      # If both are set to 'cpf', a properties file on the classpath is used.
      # http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/auth/ClasspathPropertiesFileCredentialsProvider.html
      #
      # If both are set to 'iam', use AWS IAM Roles to provision credentials.
      #
      # If both are set to 'env', use environment variables AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY

ES Sink options:

  # The following are used to authenticate for the Amazon Kinesis sink.
  #
  # If both are set to 'default', the default provider chain is used
  # (see http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/auth/DefaultAWSCredentialsProviderChain.html)
  #
  # If both are set to 'iam', use AWS IAM Roles to provision credentials.
  #
  # If both are set to 'env', use environment variables AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY

Does that make sense?

[fblundun]

That makes sense... I don't think there's any reason to keep supporting the classpath configuration option.