src: sort set elements in netlink_get_setelems()

Status from this message: Applied, thanks Elise! I'm appending this to your description BTW:

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#	Subject and files	Size	Replies	Applied
1/2	src: sort set elements in netlink_get_setelems()`include/expression.h` `src/Makefile.am` `src/mergesort.c` +1 more	+106 -0	1 reply
2/2	tests: shell: add maps tests`tests/shell/testcases/maps/0003map_add_many_elements_0` `tests/shell/testcases/maps/0004interval_map_create_once_0` `tests/shell/testcases/maps/0005interval_map_add_many_elements_0` +1 more	+228 -0	1 reply

No Reviewed-by, Acked-by or Tested-by trailers for v1 yet.