[#1509] Sync Target type with SW and DS types (#1512)

Unifies Target type with the other types
* _TargetType_ made to inhert type, thus
* _TargetType_ now has immutable _key_
* add _AbstractJpaTypeEntity_ abstraction that implement the common 'type' JPA functionallity

Signed-off-by: Marinov Avgustin <Avgustin.Marinov@bosch.com>

hawkbit-repository/hawkbit-repository-api/src/main/java/org/eclipse/hawkbit/repository/model/TargetType.java

@@ -16,11 +16,17 @@ import java.util.Set;
  * {@link Target}
  *
  */
-public interface TargetType extends NamedEntity {
+public interface TargetType extends Type {
+
     /**
-     * Maximum length of color in Management UI.
+     * Target type doesn't support soft-delete so all target type instandces re not deleted.
+     *
+     * @return <code>false</code>
      */
-    int COLOUR_MAX_SIZE = 16;
+    @Override
+    default boolean isDeleted() {
+        return false;
+    }
 
     /**
      * @return immutable set of optional {@link DistributionSetType}s
@@ -32,18 +38,6 @@ public interface TargetType extends NamedEntity {
      */
     Set<Target> getTargets();
 
-    /**
-     * Checks if the given {@link DistributionSetType} is in
-     * {@link #getCompatibleDistributionSetTypes()}.
-     *
-     * @param distributionSetType
-     *            search for
-     * @return <code>true</code> if found
-     */
-    default boolean containsCompatibleDistributionSetType(final DistributionSetType distributionSetType) {
-        return containsCompatibleDistributionSetType(distributionSetType.getId());
-    }
-
     /**
      * Checks if the given {@link DistributionSetType} is in
      * {@link #getCompatibleDistributionSetTypes()}.
@@ -64,9 +58,4 @@ public interface TargetType extends NamedEntity {
      * @return the resulting target type
      */
     TargetType removeDistributionSetType(final Long dsTypeId);
-
-    /**
-     * @return get color code to be used in management UI views.
-     */
-    String getColour();
 }