tests: test include directories

Add tests for:
  * including an empty directory
  * including directory with one or two files in it
  * testing for required trailing slash in directory name
  * testing for detecting non-existent directory
  * testing for a broken file in included directory

Signed-off-by: Ismo Puustinen <ismo.puustinen@intel.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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