Merge pull request #14155 from jelkosz/fail-migration-with-better-error

Provide better error message when migrating to the same host
(cherry picked from commit 9764860)

https://bugzilla.redhat.com/show_bug.cgi?id=1436222

app/models/vm_or_template/operations/relocation.rb

@@ -31,6 +31,10 @@ def raw_migrate(host, pool = nil, priority = "defaultPriority", state = nil)
       end
     end
 
+    if host_id == host.id
+      raise _("The VM '#{name}' can not be migrated to the same host it is already running on.")
+    end
+
     host_mor = host.ems_ref_obj
     pool_mor = pool.ems_ref_obj
     run_command_via_parent(:vm_migrate, :host => host_mor, :pool => pool_mor, :priority => priority, :state => state)