Use heuristics to create a REMOTE_CONNECTION image property

[skalkoto]

When creating an image, examine the source media and create a REMOTE_CONNECTION image property. This property can be used by the synnefo UI to inform the user on how to remotely connect to the VM he created from this image.

This property will host a space-seperated list of connection protocols the user can use to connect to his VM. The protocols we are going to allow and the properties associated with each one of them is:
ssh[:][port=NUMBER],[user=STRING]
rdp[:][port=NUMBER],[user=STRING]
vnc[:][display=NUMBER],[port=NUMBER],[password=STRING]
x2go[:][session={KDE,GNOME,LXDE,XFCE,MATE,UNITY,TRINITY,CINNAMON}]

x2go which works over ssh may inherit the properties from the ssh entry.

A valid linux desktop REMOTE_CONNECTION property would look like this:
ssh:port=22,user=root ssh:port=22,user=user x2go:session=MATE

For a Windows Server image, this is a reasonable REMOTE_CONNECTION property:
rdp:port=3389,user=Administrator