test: switch SELinux to permissive in the config file

The config file has (unfortunately) precedence over the kernel command
line, so let's tweak the config file if necessary.

test/units/testsuite-06.sh

@@ -3,12 +3,6 @@
 set -eux
 set -o pipefail
 
-echo 1 >/sys/fs/selinux/enforce || {
-    echo "Can't make selinux enforcing, skipping test"
-    touch /testok
-    exit
-}
-
 runcon -t systemd_test_start_t systemctl start hola
 runcon -t systemd_test_reload_t systemctl reload hola
 runcon -t systemd_test_stop_t systemctl stop hola