install script update
install script update

- add getopts based argument parsing
- can select what roles (=containers) to deploy on a host
- can pass extra env arguments (-e) to ansible
- roles for db and redis added
- apt-get metadata update on CentOS suppressed

CSC-IT-Center-for-Science/pouta-blueprints,CSC-IT-Center-for-Science/pouta-blueprints,CSC-IT-Center-for-Science/pouta-blueprints,CSC-IT-Center-for-Science/pouta-blueprints