include/json: Make json_array_to_lines() use compact JSON notation

include/json: Make json_array_to_lines() use compact JSON notation

Because the whitespace that is printed by jq when outputting arrays
and objects in non-compact notation does not match the whitespace
that is expected by the test cases, the tests fail.

This commit modifies the `json_array_to_lines()' function so that it
outputs data in compact JSON notation, and changes the test cases so
they do not expect any whitespace at all.