Handle 5.6.6 and 6.1.2 release

Add new version constants for 5.6.6 and 6.1.2 release.

Author: nik9000

server/src/main/java/org/elasticsearch/Version.java

@@ -109,6 +109,8 @@ public class Version implements Comparable<Version> {
     public static final Version V_5_6_5 = new Version(V_5_6_5_ID, org.apache.lucene.util.Version.LUCENE_6_6_1);
     public static final int V_5_6_6_ID = 5060699;
     public static final Version V_5_6_6 = new Version(V_5_6_6_ID, org.apache.lucene.util.Version.LUCENE_6_6_1);
+    public static final int V_5_6_7_ID = 5060799;
+    public static final Version V_5_6_7 = new Version(V_5_6_7_ID, org.apache.lucene.util.Version.LUCENE_6_6_1);
     public static final int V_6_0_0_alpha1_ID = 6000001;
     public static final Version V_6_0_0_alpha1 = new Version(V_6_0_0_alpha1_ID, org.apache.lucene.util.Version.LUCENE_7_0_0);
     public static final int V_6_0_0_alpha2_ID = 6000002;
@@ -138,6 +140,8 @@ public class Version implements Comparable<Version> {
     public static final Version V_6_1_1 = new Version(V_6_1_1_ID, org.apache.lucene.util.Version.LUCENE_7_1_0);
     public static final int V_6_1_2_ID = 6010299;
     public static final Version V_6_1_2 = new Version(V_6_1_2_ID, org.apache.lucene.util.Version.LUCENE_7_1_0);
+    public static final int V_6_1_3_ID = 6010399;
+    public static final Version V_6_1_3 = new Version(V_6_1_3_ID, org.apache.lucene.util.Version.LUCENE_7_1_0);
     public static final int V_6_2_0_ID = 6020099;
     public static final Version V_6_2_0 = new Version(V_6_2_0_ID, org.apache.lucene.util.Version.LUCENE_7_2_1);
     public static final Version CURRENT = V_6_2_0;
@@ -155,6 +159,8 @@ public static Version fromId(int id) {
         switch (id) {
             case V_6_2_0_ID:
                 return V_6_2_0;
+            case V_6_1_3_ID:
+                return V_6_1_3;
             case V_6_1_2_ID:
                 return V_6_1_2;
             case V_6_1_1_ID:
@@ -179,6 +185,8 @@ public static Version fromId(int id) {
                 return V_6_0_0_alpha2;
             case V_6_0_0_alpha1_ID:
                 return V_6_0_0_alpha1;
+            case V_5_6_7_ID:
+                return V_5_6_7;
             case V_5_6_6_ID:
                 return V_5_6_6;
             case V_5_6_5_ID: