IM-Dashboard version 2.5.7

• Add Disk size and GPUs in VM resize form: #586
• Add support to greater_than and less_than TOSCA constaints: #584
• Consistent order of infrastructures: #581
• Enable vm_role not only as a role but also as a group: #578
• Error configuing some templates: #567
• Include direct link to helpdesk: #566
• Change status name in IM Dashboard: #559
• Make AppDB or Site image unselectable if the other one is selected: #550
• Specify what types of SSH key are supported: #549
• Improve ID in cloud credentials enhancement: #548
• VM resize operation removes floating IP: #534