Added proper handling of state transitions during application scale down

.../nmservice/deployment/NmServiceDeploymentCoordinator.java

...aas/nmservice/deployment/NmServiceDeploymentProvider.java

...erorchestrators/kubernetes/KServiceOperationsManager.java

.../containerorchestrators/kubernetes/KubernetesManager.java

.../components/cluster/DefaultKServiceOperationsManager.java

...service/deployment/entities/NmServiceDeploymentState.java

.../deployment/exceptions/CouldNotPauseServiceException.java

...deployment/exceptions/CouldNotResumeServiceException.java

...java/net/geant/nmaas/orchestration/AppLifecycleState.java

...eant/nmaas/orchestration/entities/AppDeploymentState.java

...net/geant/nmaas/orchestration/tasks/app/AppScaleTask.java

...a/net/geant/nmaas/portal/api/domain/AppInstanceState.java

.../geant/nmaas/portal/api/market/AppInstanceController.java

.../nmaas/orchestration/entities/AppDeploymentStateTest.java

src/test/shell/data/i18n/de.json

src/test/shell/data/i18n/en.json

src/test/shell/data/i18n/fr.json

src/test/shell/data/i18n/pl.json