change Variant.variation type to VRS variation

Author: redmitry

beacon-data-model/src/main/java/es/bsc/inb/ga4gh/beacon/model/v200/variations/BeaconVariation.java

@@ -34,5 +34,6 @@
  * @author Dmitry Repchevsky
  */
 
-public interface BeaconVariation extends Serializable {
+public interface BeaconVariation extends es.bsc.inb.ga4gh.vrs.model.Variation,
+        Serializable {
 }

beacon-data-model/src/main/java/es/bsc/inb/ga4gh/beacon/model/v200/variations/Variant.java

@@ -25,6 +25,7 @@
 
 package es.bsc.inb.ga4gh.beacon.model.v200.variations;
 
+import es.bsc.inb.ga4gh.vrs.model.AbstractVariation;
 import java.io.Serializable;
 import java.util.List;
 
@@ -45,7 +46,7 @@
 public interface Variant<K extends Position, L extends Identifiers, 
         M extends MolecularAttributes, N extends CaseLevelVariant,
         O extends VariantLevelData, P extends PopulationFrequencies,
-        Q extends BeaconVariation> extends Serializable {
+        Q extends AbstractVariation> extends Serializable {
 
     String getVariantInternalId();
     void setVariantInternalId(String variantInternalId);