testsuite: use virt-addr to get IP of a VM

Signed-off-by: Richard Marko <rmarko@redhat.com>
testsuite: use nat instead of bridge

Signed-off-by: Richard Marko <rmarko@redhat.com>
testsuite: update URL used in emails

Signed-off-by: Richard Marko <rmarko@redhat.com>
testsuite: disable GPG check for el7

Signed-off-by: Richard Marko <rmarko@redhat.com>