Configure installation of DB2 client driver, runtime and
development files from IBM Data Server Driver Package (DS Driver)
package (required manual download from sign-in protected IBM site,
see vagrant.md doc).
Vagrant can now build SOCI with DB2 backend.
[ci skip]
Provision virtual development environment for SOCI.
Currently, only main VM is provisioned: soci.
In future, oracle and db2 are planned to allow connections
from the soci and perform testing of corresponding backends.
[ci skip]