TestZFrame validation methods should be moved to common methods

[sonalgoyal]

Duplicate code like

for (int idx = 0; idx < sampleData.size(); idx++) {
            R row = rows.get(idx);
            for (Field column : fields) {
                String columnName  = column.getName();
                if (column.getType() == String.class) {
                    assertEquals(column.get(sampleData.get(idx)), zFrameSortedDesc.getAsString(row, columnName),
                            "value in ZFrame and sample input is not same");
                } else if (column.getType() == Integer.class) {
                    assertEquals(column.get(sampleData.get(idx)), zFrameSortedDesc.getAsInt(row, columnName),
                            "value in ZFrame and sample input is not same");
                } else if (column.getType() == Double.class) {
                    assertEquals(column.get(sampleData.get(idx)), zFrameSortedDesc.getAsDouble(row, columnName),
                            "value in ZFrame and sample input is not same");
                } else if (column.getType() == Long.class) {
                    assertEquals(column.get(sampleData.get(idx)), zFrameSortedDesc.getAsLong(row, columnName),
                            "value in ZFrame and sample input is not same");
                } else {
                    throw new Exception("Not a valid data type");
                }
            }
        }

AND

for (Person schema : sampleDataWithDistinctSurnameAndPostCode) {
            for (R row : rows) {
                boolean rowMatched = true;
                for (Field column : fields) {
                    String columnName = column.getName();
                    if (!column.get(schema).toString().
                            equals(zFrame.getAsString(row, columnName))) {
                        rowMatched = false;
                        break;
                    }
                }
                if (rowMatched) {
                    matchedCount++;
                    break;
                }
            }
        }

        assertEquals(rows.size(), matchedCount,
                "rows count is not as expected");
        assertEquals(sampleDataWithDistinctSurnameAndPostCode.size(), matchedCount,
                "rows count is not as expected");