Enable the use of sensible values for credentials and other security related settings for OpenConext

The changes in this pull request allow the OpenConext VM to fill the config files with sensible values
Hi-level overview of changes:
- Set admin contact details
- Set timezone
- use crypted passwords for LDAP/SLAPD
- Set individual db credentials for all OpenConext components
- Set individual API credentials for various componens
- Create new ROOT CA and subsquent Certificates
- Credentials now set in oc_config file
- Added script that will set oc_config with strong passwords