pkcs11: disable testing on el7, don't limit them on Fedora

On el7, connection fail because wpa_supplicant or openssl can't load
shared library despite it being registered in p11-kit, see [1] for
details. Unless this bug gets fixed, let's disable these test on el7.
https://bugzilla.redhat.com/show_bug.cgi?id=2005936

OTOH, this should work on Fedora with wifi as well as on ethernet so
let's remove the same checks over there.
5 jobs for !843 with dj/pkcs11-disable-on-el7 in 2 minutes and 13 seconds
latest detached
Status Name Job ID Coverage
  Test
passed TestResults #13823586
manual

00:01:03

passed UnitTests #13823585

00:01:10

 
  External
failed https://desktopqe-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/job/beaker-NetworkManager-gitlab-trigger-test-upstream/1912/

passed https://jenkins-networkmanager.apps.ocp.ci.centos.org/job/NetworkManager-test-mr/729/

00:31:47

failed https://desktopqe-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/job/beaker-NetworkManager-gitlab-trigger-test-upstream/1912/

00:03:49