Fixed nexus-exam compile error

Fixed newly introduced csv parsing error
Moved most client utils functions to libclient
nexus-exam: changed token refresh delay to 2 min

src/server/vms/vms.go

@@ -872,9 +872,7 @@ func (vms *VMs) DeleteFileFromVM(vm *VM, filePath string) error {
 	}
 
 	vm.DiskBusy = true
-	defer func(vm *VM) {
-		vm.DiskBusy = false
-	}(vm)
+	defer func(vm *VM) { vm.DiskBusy = false }(vm)
 
 	if err := exec.DeleteFromVM(vm.getDiskPath(), filePath); err != nil {
 		msg := prefix + err.Error()