Identify a server role VM in list machines

[fv3rdugo]

Show a server bagde in list machines view when a virtual machine has a server role. This allows a better identification. For example, setting an option in Options setting tab like:

• This VM has a server role [ ]

[frankiejol]

@fv3rdugo what about adding a more general "badges" section to the machine settings ? We could then add things like: server, workstation, linux, windows, pxe ( or diskless ), gateway ...