gitlab-ci: Refactor code that show logs of failed acceptances

Replace the code (python) on after_script of the acceptance jobs that
is currently used to show the logs of failed tests. Instead it is used
the Avocado's testlogs plug-in which works likewise.

Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Reviewed-by: Willian Rampazzo <willianr@redhat.com>
Message-Id: <20201211183827.915232-3-wainersm@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

.gitlab-ci.yml

@@ -58,13 +58,14 @@ include:
     - echo "[datadir.paths]" > ~/.config/avocado/avocado.conf
     - echo "cache_dirs = ['${CI_PROJECT_DIR}/avocado-cache']"
            >> ~/.config/avocado/avocado.conf
+    - echo -e '[job.output.testlogs]\nstatuses = ["FAIL"]'
+           >> ~/.config/avocado/avocado.conf
     - if [ -d ${CI_PROJECT_DIR}/avocado-cache ]; then
         du -chs ${CI_PROJECT_DIR}/avocado-cache ;
       fi
     - export AVOCADO_ALLOW_UNTRUSTED_CODE=1
   after_script:
     - cd build
-    - python3 -c 'import json; r = json.load(open("tests/results/latest/results.json")); [print(t["logfile"]) for t in r["tests"] if t["status"] not in ("PASS", "SKIP", "CANCEL")]' | xargs cat
     - du -chs ${CI_PROJECT_DIR}/avocado-cache
 
 build-system-ubuntu: