Split out the static functions from the TestAwsRegion class to a separate AwsEndpointTestData class to allow for re-use (specifically by the TestAwsEndpoint class).
Added AwsEndpointTestData::hostnames().
Added the AwsEndpointTestData::hostInfoMap function.
Removde the now-somewhat redundant AwsEndpointTestData::hostnames function (use AwsEndpointTestData::hostInfoMap().keys() instead).