Simplify state reconciliation and support changing Softnet settings (#364)

* Simplify state reconciliation and support changing Softnet settings

* Remove unused "updateFunc" parameter from syncOnDiskVMs()

* Don't take an address of a loop variable

* ensure → ensures

* updateVMState(): don't forget to update VMState

* Introduce TestSpecUpdateSoftnet integration test

* Update OpenAPI specification to include generation/observedGeneration

internal/controller/api_controller.go

@@ -1,11 +1,12 @@
 package controller
 
 import (
+	"net/http"
+
 	"github.com/cirruslabs/orchard/internal/responder"
 	"github.com/cirruslabs/orchard/internal/version"
 	v1pkg "github.com/cirruslabs/orchard/pkg/resource/v1"
 	"github.com/gin-gonic/gin"
-	"net/http"
 )
 
 func (controller *Controller) controllerInfo(ctx *gin.Context) responder.Responder {
@@ -17,6 +18,7 @@ func (controller *Controller) controllerInfo(ctx *gin.Context) responder.Respond
 
 	capabilities := []v1pkg.ControllerCapability{
 		v1pkg.ControllerCapabilityRPCV1,
+		v1pkg.ControllerCapabilityVMStateEndpoint,
 	}
 
 	if controller.experimentalRPCV2 {