Squashed commit of the following

commit 07cf8431 
Author: zhijie wang <wanzhiji@amazon.com> 
Date: Tue Dec 29 2020 09:31:46 GMT-0800 (Pacific Standard Time) 

    fix minor env name


commit f3afaca1 
Author: zhijie wang <wanzhiji@amazon.com> 
Date: Tue Dec 29 2020 07:15:36 GMT-0800 (Pacific Standard Time) 

    swap env line


commit 8b5b33fc 
Author: zhijie wang <wanzhiji@amazon.com> 
Date: Mon Dec 28 2020 18:52:44 GMT-0800 (Pacific Standard Time) 

    revert back region + endpoint, modify env setup


commit e05ce2e8 
Author: zhijie wang <wanzhiji@amazon.com> 
Date: Mon Dec 28 2020 18:23:00 GMT-0800 (Pacific Standard Time) 

    fix S3 client instantiation


commit ee38f441 
Author: zhijie wang <wanzhiji@amazon.com> 
Date: Mon Dec 28 2020 13:53:19 GMT-0800 (Pacific Standard Time) 

    suppress verbose log


commit d6134fbd 
Author: zhijie wang <wanzhiji@amazon.com> 
Date: Mon Dec 28 2020 13:41:10 GMT-0800 (Pacific Standard Time) 

    resolve region


commit b8720bf2 
Author: zhijie wang <wanzhiji@amazon.com> 
Date: Mon Dec 28 2020 13:14:41 GMT-0800 (Pacific Standard Time) 

    bump core service version


commit 110f48ec 
Author: zhijie wang <wanzhiji@amazon.com> 
Date: Mon Dec 21 2020 13:14:08 GMT-0800 (Pacific Standard Time) 

    bump os-core-lib-aws version