Adds support for ECS by using DefaultAWSCredentialsProviderChain, and AWS session credentials.

[grommitz]

Adds AwsCredentialsProviderUtils.getProvider() which gets the correct AWSCredentialsProvider depending on what environment variables are configured. If there are none given, it falls back to DefaultAWSCredentialsProviderChain which will yield the correct provider for ECS (for example).

Also adds support for session credentials, and makes the AWS reqion configurable in the example.

Replaces PR #360.

[JamesHillyard]

Hi @grommitz

Thank you for submitting a PR, we are happy to receive your contribution, but before we can proceed you will need to sign the CLA and send it to us.

Payara/PayaraCLA.pdf at master · payara/Payara

Thanks James