Patch 1/3:

Fix a typo when setting sercons.  While I'm there also add proper
quotes.

Ticket: #4266
Patch 2/3:

Rewrite sercons handling: Don't rely on conscontrol to output consoles
in specified order.

Ticket: #4266
Patch 3/3:

When serial console is enabled, prefer serial console.

Ticket: #4266