[#1509] Sync Target type with SW and DS types (targettype.key search) (#1515)

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

hawkbit-core/src/main/java/org/eclipse/hawkbit/repository/TargetFields.java

@@ -91,7 +91,7 @@ public enum TargetFields implements FieldNameProvider {
     /**
      * The target type.
      */
-    TARGETTYPE("targetType", TargetTypeFields.NAME.getFieldName());
+    TARGETTYPE("targetType", TargetTypeFields.KEY.getFieldName(), TargetTypeFields.NAME.getFieldName());
 
     private final String fieldName;
     private List<String> subEntityAttribues;

hawkbit-core/src/main/java/org/eclipse/hawkbit/repository/TargetTypeFields.java

@@ -14,6 +14,10 @@ package org.eclipse.hawkbit.repository;
  * the REST API
  */
 public enum TargetTypeFields implements FieldNameProvider {
+    /**
+     * The name field.
+     */
+    KEY("key"),
     /**
      * The name field.
      */