removed unneeded method.

Author: Justin Lee

driver-core/src/main/com/mongodb/ServerAddress.java

@@ -129,16 +129,6 @@ public ServerAddress(final String host, final int port) {
         this.port = portToUse;
     }
 
-    private String join(final String delimiter, final String[] array, final int start, final int end) {
-        StringBuilder builder = new StringBuilder();
-        for (int i = start; i <= end; i++) {
-            builder.append(array[i]);
-            if (i < end) {
-                builder.append(delimiter);
-            }
-        }
-        return builder.toString();
-    }
     @Override
     public boolean equals(final Object o) {
         if (this == o) {