test: Use TEST macro in more cases

test: Use TEST macro in more cases

This converts to TEST macro in less trivial cases. This is mostly
due to having an intro or outro before/after the actual tests.

Some notable changes:
 - add a "test" to make sure the hashmap and ordered_hashmap tests
   from different compilation units are actually run in test-hashmap.c
 - make root arg a global var in test-install-root.c
 - slightly rework an EFI specific test in test-proc-cmdline.c
 - usage of saved_argv/saved_argc in test-process-util.c
 - splitting test-rlimit-util.c into several tests
 - moving the hwdb open check into intro in test-sd-hwdb.c
 - condense several "tests" into one in test-udev-util.c