tests/bloom_bytes does not print float

[cladmi]

Description

tests/bloom_bytes does not correctly print floats on samr21-xpro as printf_float is not included
Also, on arduino-mega2560 the float is printed as ? as there is no float handling.

The issue will be similar to #10999

Steps to reproduce the issue

BOARD=samr21-xpro make -C tests/bloom_bytes/ flash test

2019-02-21 15:34:06,119 - INFO #
2019-02-21 15:34:06,122 - INFO # 267 elements probably in the filter.
2019-02-21 15:34:06,125 - INFO # 9733 elements not in the filter.
2019-02-21 15:34:06,127 - INFO #  false positive rate.

There is nothing before false positive rate.

Expected results

2019-02-21 15:50:35,469 - INFO # checking 10000 elements took 2468ms
2019-02-21 15:50:35,469 - INFO #
2019-02-21 15:50:35,472 - INFO # 267 elements probably in the filter.
2019-02-21 15:50:35,475 - INFO # 9733 elements not in the filter.
2019-02-21 15:50:35,478 - INFO # 0.026700 false positive rate.

Actual results

2019-02-21 15:34:06,127 - INFO #  false positive rate.

Versions

Every versions until now I think. But lets say the last release 2019.01.