init exception

src/main/java/net/geant/nmaas/nmservice/deployment/exceptions/CouldNotScaleDownNmServiceException.java

+package net.geant.nmaas.nmservice.deployment.exceptions;
+
+public class CouldNotScaleDownNmServiceException extends RuntimeException {
+
+    public CouldNotScaleDownNmServiceException(String message) {
+        super(message);
+    }
+}

src/main/java/net/geant/nmaas/nmservice/deployment/exceptions/CouldNotScaleUpNmServiceException.java

+package net.geant.nmaas.nmservice.deployment.exceptions;
+
+public class CouldNotScaleUpNmServiceException extends RuntimeException {
+
+    public CouldNotScaleUpNmServiceException(String message) {
+        super(message);
+    }
+}