public static String toString(final byte[] b1, String sep, final byte[] b2) {
    return toString(b1, 0, b1.length) + sep + toString(b2, 0, b2.length);
  }
Joins two byte arrays together using a separator.
@param b1  The first byte array.
@param sep The separator to use.
@param b2  The second byte array.
hbase-common/src/main/java/org/apache/hadoop/hbase/util/Bytes.java