The package resource in the oslo::db define uses the fixed name
db_backend_package. This is a bad idea because it causes
'duplicate definition' errors on deployments using multiple database
backends that require a package install (like mysql and mongodb).
In stead, just use the actual package name. This prevents duplicate
definitions.
Change-Id: I03a5741865a7519506cbd9f567a24ff42e27f39a
Signed-off-by: Tom Verdaat <tom@server.biz>