Providing a region and a roleArn still uses global STS endpoint

[jhulten]

When you pass a roleArn and a region, a AWSSecurityTokenServiceClient is built that still uses the global STS endpoint. This does not allow use in an isolated VPC outside of us-east-1.

spark-dynamodb/src/main/scala/com/audienceproject/spark/dynamodb/connector/DynamoConnector.scala

Lines 78 to 82 in f4bfff1

	val stsClient = AWSSecurityTokenServiceClientBuilder
	.standard()
	.withCredentials(new DefaultAWSCredentialsProviderChain)
	.withRegion(chosenRegion)
	.build()