Fix downloading s3cmd

Signed-off-by: Andrei Dinin <adinin@pivotal.io>
Install aws cli

Signed-off-by: Andrei Dinin <adinin@pivotal.io>
Install pip with apt-get

Signed-off-by: Andrei Dinin <adinin@pivotal.io>
Do apt-get update before installing dependencies

Signed-off-by: Andrei Dinin <adinin@pivotal.io>
Only install aws cli when it is not already installed

Signed-off-by: Andrei Dinin <adinin@pivotal.io>
Fix bats bucket

Signed-off-by: Andrei Dinin <adinin@pivotal.io>