Skip rails seeds on a Geo secondary node

What does this Merge Request do?

Skips database seeding when in a Geo secondary instance

This looks at gdk.yml configuration for geo.secondary being true.

Seeding is not necessary as we will drop the database anyway as part of establishing a database replication.

Merge Request checklist

• Tests added for new functionality. If not, please raise Issue to follow-up.
• This change is backward compatible. If not, please include steps to communicate to our users.
• Documentation added/updated, if needed.
• gdk doctor test added, if needed.

Closes #763 (closed)