tests: Reduce the total number of self-test files and add ET_REL files.

Some self tests would run for a really long time (especially under valgrind)
because we included all libebl backends in the list (there are 12 backends).
Now only test two explicitly. Also there were no ET_REL files in the
self test file list. So add two ET_REL files. The total number of self test
files is now 12.

run-nm-self.sh would run 4 * 3 * 3 * 22 = 792 tests (on all self test files).
Reduce the number of different files to test to 3 (one ET_EXEC, one ET_DYN
and one ET_REL file). Reducing the number of test runs to 99.

Signed-off-by: Mark Wielaard <mjw@redhat.com>
3 files changed