update and review docker images

[jorgejesus]

Description

Docker images are 2 years old and require update

Environment

• operating system:
• Python version:
• PyWPS version:
• source/distribution
• [ ] git clone
• [ ] Debian
• [ ] PyPI
• [ ] zip/tar.gz
• [ ] other (please specify):
• web server
• [ ] Apache/mod_wsgi
• [ ] CGI
• [ ] other (please specify):

Steps to Reproduce

Additional Information

Consider also issue #43