Add some project checking sanity for when a project is deleted

Conflicts:
	libexec/novac-list-volumes
Fix list-users. Can't remember why LIMIT 5 was added.
Port projects.rb to mysql2

Conflicts:
	share/novac/lib/rb/projects.rb (+5 squashed commits)
Squashed commits:
[90cb610] Port novac-secgroup-list to use mysql2
[35eacbb] Port novac-list-volumes to use mysql2

Conflicts:
	libexec/novac-list-volumes
[26bd6c2] novac list-users now uses mysql2 as well

Conflicts:
	share/novac/lib/rb/users.rb
[44a7ff8] Migrate list-instances to MySQL2 gem. Not much performance increase

Conflicts:
	libexec/novac-list-instances
[d9f51c1] Port list-images to mysql2

Conflicts:
	libexec/novac-list-images