Issue #30 scripts to perform setup at specific configuration levels (machine, postgres, database) to simplify HAF deployment

Defined scripts:

• build.sh encapsulating a build process
• setup_ubuntu.sh containing basic environment setup (i.e. pure Ubuntu machine or definition of CI base docker image. See Dockerfile for usage example.
• setup_postgres.sh being responsible for creation of all builtin HAF roles (on PostgreSQL instance), deploying already built hive_fork_manager PostgreSQL extension like also creation of haf_admin user role having permissions to deploy extension into new created database
• setup_db.sh useful to create and setup some database to be filled by HAF
• setup_haf_instance.sh joins together all above scripts to perform one-step setup of hived node supporting HAF.