feat(healthcheck): Add a state to the endpoint

See gravitee-io/issues#91

model/src/main/java/io/gravitee/definition/model/Endpoint.java

@@ -82,10 +82,36 @@ public void setStatus(Status status) {
         this.status = status;
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        Endpoint endpoint = (Endpoint) o;
+
+        return target != null ? target.equals(endpoint.target) : endpoint.target == null;
+
+    }
+
+    @Override
+    public int hashCode() {
+        return target != null ? target.hashCode() : 0;
+    }
+
     public enum Status {
-        UP,
-        DOWN,
-        TRANSITIONALLY_DOWN,
-        TRANSITIONALLY_UP
+        UP(3),
+        DOWN(0),
+        TRANSITIONALLY_DOWN(1),
+        TRANSITIONALLY_UP(2);
+
+        private final int code;
+
+        Status(int code) {
+            this.code = code;
+        }
+
+        public int code() {
+            return this.code;
+        }
     }
 }