build-unit-test-docker:  Fetch nlohmann/fifo_map

This package allows JSON objects to be ordered in a FIFO
manner instead of the typical JSON object which has no
key order guarantees.

It is first used by phosphor-logging.

Change-Id: I668dd194644e109abf0ebecc6d6ed18b5dac4601
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
1 file changed