Update Dockerfiles

Upgrade Docker to 20.10.9 and pin python setuptools to 57.4.0

Update SSM agent versions

Merge pull request aws#453 from rasarora/master

Update Linux Images

Merge pull request aws#435 from xgnl/master

Update Python runtime versions

add back license notice

Merge pull request aws#384 from aws/dockerfile-sync

Golang version upgrade and SSM agent update.

Merge pull request aws#384 from aws/dockerfile-sync

Golang version upgrade and SSM agent update.

Merge pull request aws#364 from awszhen/aws/20.06.15

Update Linux and ARM Dockerfiles

Merge pull request aws#350 from awszhen/aws/20.05.05

Add Linux standard images legal files