tests: shell: add testcase for different defines usage

tests: shell: add testcase for different defines usage

This testcase add some defines in a nft -f run and then uses
them in different spots (which are not covered in previous testcases).

 * defines used to define another one
 * different datatypes (numbers, strings, bits, ranges)
 * usage in sets, maps, contatenatios
 * single rules with single statements, multiple statements
 * reuse define in same rule

Perhaps this isn't testing many different code path, but I find this
interesting to have given it will probably be one of the most common
use cases of nftables.

Signed-off-by: Arturo Borrero Gonzalez <arturo@debian.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>