AppNexus: Update inventory attribute measure source e2e test
 * Update test validation for new client-testing integration environment
AppNexus: App AuthN + local test fixes
AppNexus: Update local app testing script
 * Key off whether target config exists rather than local
AppNexus: Update ApnxAppSand to work in client-test integration environment
 * Updated plugin id and server url pattern
 * Update App authN to work with latest website/api layout
Utilities: Option to include existing data costs when generating data costs CSV template