improve login/logout/cookie behaviour

improve login/logout/cookie behaviour

this changes the login/logout/cookie behaviour

if you go to /quarantine
    you get to the loginview
    except you have a valid cookie
    or you have a ticket via url (this takes precedence)

    when you have a valid login
	you go to the quarantineview
else if you have not a quarantine ticket
    you get to the mainview
else
    you get to the loginview

also adds a logout button to the quarantineview
and moves the viewchange/logout logic to the Application.js

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>