AWS Ecs impl changes

commit ff2e37a9 Author: Rucha deshpande deshruch@amazon.com Date: Thu Aug 13 2020 12:20:42 GMT-0500 (Central Daylight Time)

Adding appropriate copyright statement

commit 3abe2d51 Author: Rucha deshpande deshruch@amazon.com Date: Mon Aug 10 2020 08:58:06 GMT-0500 (Central Daylight Time)

build command update to build aws impl only

commit b656234a Author: Rucha deshpande deshruch@amazon.com Date: Sun Aug 09 2020 16:55:19 GMT-0500 (Central Daylight Time)

entitlements on ecs  update