As it has already been done to some other tests, two other tests have
been producing false positives.  This has been observed recently in
package builds in build farms.

Let's run them only when `make check-full` is called, which is
usually done at dedicated machines with plenty of resources.

Reference: https://kojipkgs.fedoraproject.org/work/tasks/9189/19059189/build.log
Reference: https://kojipkgs.fedoraproject.org/work/tasks/9445/19069445/build.logSigned-off-by: NCleber Rosa <crosa@redhat.com>