checkstyle fixes with actual code change

Author: benjamin-confino

tck/src/main/java/org/eclipse/microprofile/openapi/apps/airlines/data/UserData.java

@@ -19,7 +19,7 @@
 import org.eclipse.microprofile.openapi.apps.airlines.model.User;
 
 public class UserData {
-    static List<User> users = new ArrayList<User>();
+    static private List<User> users = new ArrayList<User>();
 
     static {
         users.add(createUser(1, "Bob1", "pswd", "Bob", "Smith", "male", 12,

tck/src/main/java/org/eclipse/microprofile/openapi/apps/petstore/data/PetData.java

@@ -23,8 +23,8 @@
 import org.eclipse.microprofile.openapi.apps.petstore.model.Tag;
 
 public class PetData {
-    static List<Pet> pets = new ArrayList<Pet>();
-    static List<Category> categories = new ArrayList<Category>();
+    static private List<Pet> pets = new ArrayList<Pet>();
+    static private List<Category> categories = new ArrayList<Category>();
 
     static {
         categories.add(createCategory(1, "Dogs"));

tck/src/main/java/org/eclipse/microprofile/openapi/apps/petstore/resource/PetResource.java

@@ -77,7 +77,7 @@
 })
 public class PetResource {
 
-    static PetData petData = new PetData();
+    static private PetData petData = new PetData();
 
     @GET
     @Path("/{petId}")

tck/src/main/java/org/eclipse/microprofile/openapi/apps/petstore/resource/PetStoreResource.java

@@ -59,8 +59,8 @@
 @Extension(name = "x-mp-type1", value = "true")
 @Extension(name = "x-mp-type2", value = "false")
 public class PetStoreResource {
-    static StoreData storeData = new StoreData();
-    static PetData petData = new PetData();
+    static private StoreData storeData = new StoreData();
+    static private PetData petData = new PetData();
 
     @GET
     @Path("/inventory")