Proper argument parsing for job generation

This might break some jobs, as the setup type is no longer an argument.
It's an option, so from now, the -t SETUP_TYPE must be used.
User can specify the ubuntu distro
Initial commit of jeos regenerator

This was extracted from the jenkins job
Override template name as well
Use of internal repositories could be turned off
Add regenerate-jeos job
Merge pull request #91 from matelakat/regenerate-jeoses

Regenerate jeoses