Log Message:
Update databases/libdbi-drivers-* to 0.9.0.

- some of the drivers now export client library functions to the
  programmer via the dbi_driver_specific_function() interface
- if necessary, the drivers now support libdbi instances
- a segfault in the oracle driver caused by INSERT statements was
  fixed
- the pgsql driver now supports features specific to PostgreSQL 9
  and later
- drivers now support transactions and savepoints if the
  underlying database engines do
- additional libdbi hint about position in a result set allows
  tremendous speedup of sequential reads from MySQL result sets
- various memory leaks were plugged
- database specific test scripts allow tests without affecting
  existing database clusters
- completely rewritten test kit increases coverage and improves
  error reporting