1.0.1

Fixes to Ubuntu 16.04 and Ubuntu 18.04

• installation of xz-utils package on 16.04 & 18.04
• install pip==20.3.4 on 16.04 as the only latest supported version on python 3.5

1.0.0

Refactor CentOS images to reduce size

• Set as multi stage build
• Install pip packages with --no-cache-dir for size reduction.
• Prevent installation of recommended packages. Only install required and dependent packages.
• Find log files in /var/log and empty them for size reduction.