Fix IPFSGroupScan.

Author: dbw9580

contrib/storage-ipfs/src/main/java/org/apache/drill/exec/store/ipfs/IPFSGroupScan.java

@@ -75,6 +75,10 @@ public class IPFSGroupScan extends AbstractGroupScan {
   private List<SchemaPath> columns;
 
   private static final long DEFAULT_NODE_SIZE = 1000L;
+  private static final int DEFAULT_USER_PORT = 31010;
+  private static final int DEFAULT_CONTROL_PORT = 31011;
+  private static final int DEFAULT_DATA_PORT = 31012;
+  private static final int DEFAULT_HTTP_PORT = 8047;
 
   private ListMultimap<Integer, IPFSWork> assignments;
   private List<IPFSWork> ipfsWorkList = Lists.newArrayList();
@@ -130,10 +134,10 @@ private void init() {
           //DRILL-7754: read ports & version info from IPFS instead of hard-coded
           ep = DrillbitEndpoint.newBuilder()
               .setAddress(peerHostname)
-              .setUserPort(31010)
-              .setControlPort(31011)
-              .setDataPort(31012)
-              .setHttpPort(8047)
+              .setUserPort(DEFAULT_USER_PORT)
+              .setControlPort(DEFAULT_CONTROL_PORT)
+              .setDataPort(DEFAULT_DATA_PORT)
+              .setHttpPort(DEFAULT_HTTP_PORT)
               .setVersion(DrillVersionInfo.getVersion())
               .setState(DrillbitEndpoint.State.ONLINE)
               .build();