obis: fixed vagrant setup; added second vm for additional obis client

src/vagrant/obis/README.md

src/vagrant/obis/Vagrantfile

src/vagrant/obis/initialize/install_obis.sh

src/vagrant/obis/initialize/setup_general.sh

src/vagrant/obis/initialize/setup_obis.sh

src/vagrant/obis/initialize/setup_openbis.sh