Do not drop databases without a good reason

We don't always use os-db-create on an empty database server. This script
should just create, as its name implies. Dropping whole databases is an
extremely important operation and should not be done "just in case".

Change-Id: I1dbdab0fd81ba6abbd87b5bd6fcf213f0fe51455
Merge "Do not drop databases without a good reason"