Reduce Jetson docker size

[DvirDukhan]

[chayim]

Smallest possible size.

[chayim]

Size reduced through these changes. We'll continue to iterate on this ticket if necessary. Leaving open for now, with initial PR merged to master.

[rafie]

@chayim I'm afraid docker image will not reduce in size unless we squash via docker build --squash, which is an experimental docker daemon feature, but might be available on our side.

[chayim]

Squash is randomly unstable - I run it on my desktop for a personal project and it has produced more than it's fair share of broken images. Mind you, it's gotten a lot better than 17.05. Maybe time to revisit.

[rafie]

@chayim I prefer to take the Buildah route (where you can cp, rm, and then commit).

[chayim]

Updated ask: Need to look at nvidia dockers for jetson as the base image.