Close bsddb databases in the unit test cleanup
Close bsddb databases in the unit test cleanup

This fixes a warning as the Python interpreter shuts down.

tiagochiavericosta/cobe,tiagochiavericosta/cobe,LeMagnesium/cobe,meska/cobe,wodim/cobe-ng,pteichman/cobe,LeMagnesium/cobe,wodim/cobe-ng,DarkMio/cobe,pteichman/cobe,DarkMio/cobe,meska/cobe