New options and bug fixes

New features:

• Introduce illuminatio generate command that generates the test cases,
  outputting them to a target file. Generated test cases can be specified
  to illuminatio run using the new -t/--test-cases flag. (#110)
• Add -c/--cri-socket option to configure cri socket path to
  illuminatio run. (#96)

User-facing bug fixes:

• Fix illuminatio creating illegal service names for NetworkPolicy
  selecting long labels. (#122)
• Fix test generation failing for NetworkPolicy ports without port value (#120)
• Fix NetworkPolicy label selectors with labels containing . not being
  supported. (#118)

Other changes:

• Fix nmap error in travis (#119)
• Fix e2e tests (#121)
• Cleanup test generator tests (#116)
• Wait until docker registry is ready (#117)
• Use latest minikube version (#108)
• Make use of python-nmap (#109)
• Minor fixes (#115)
• Cleanup runner image (#106)
• Simplify travis file and lint target (#107)
• Add labels during namespace creation (#99)
• Propagete log level to illuminatio runner (#100)
• Add blog post to refernce and cleanup codeowners (#97)