Validate dbpath for AFP

Ticket:	#5011
Use an empty /boot.config explicitly

This solves an issue where some systems expect some sort
of input when their IPMI console is active.
Add feature to upgrade a pool from GUI

Ticket:	#4970
Add missing upgrade icon

Ticket:	#4970
Update /boot.config if serial console is enabled/disabled
Increase responsiveness of the alert system.
Use correct build options for virtualbox
Show enclosure id in old volume manager

Ticket:	#5056
Add API endpoint to upgrade a volume
Document volume upgrade API endpoint
Add alert about the volume/pool version

Ticket:	#4901