change 'workflow' state on AuctionItem save

Problem/Motivation

When saving an auction with the start date of now (or earlier), Auction should be open. Currently, have to wait until cron is ran before auction is set to open.

Steps to reproduce

• Create an auction node with start date set to before the current time, and end date after current time.
• Save the node.
• Viewing node, it says "Bidding is not yet Open"
• Run Cron
• Viewing node, it now shows the bidding form.

Proposed resolution

When saving node / auction item, update the workflow.

Remaining tasks

Implement changes

User interface changes

None

API changes

TBD

Data model changes

None