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