test: load the SELinux module outside of the VM

Turns out we can, apart from just building the module, "shove" it into
the SELinux database in a chroot as well. This brings quite significant
time savings, as the SELinux db rebuild takes 2 - 5 minutes in a VM
without acceleration (and takes currently ~half of the runtime of the test
in the C8S job).

test/TEST-06-SELINUX/test.sh

@@ -42,16 +42,14 @@ test_append_files() {
     fi
 
     mkdir "$workspace/systemd-test-module"
-    cp systemd_test.te "$workspace/systemd-test-module"
-    cp systemd_test.if "$workspace/systemd-test-module"
-    cp systemd_test.fc "$workspace/systemd-test-module"
+    cp -v systemd_test.* "$workspace/systemd-test-module/"
     image_install -o sesearch
     image_install runcon
     image_install checkmodule semodule semodule_package m4 make load_policy sefcontext_compile
     image_install -o /usr/libexec/selinux/hll/pp # Fedora/RHEL/...
     image_install -o /usr/lib/selinux/hll/pp     # Debian/Ubuntu/...
 
-    if ! chroot "$workspace" make -C /systemd-test-module -f /usr/share/selinux/devel/Makefile clean systemd_test.pp; then
+    if ! chroot "$workspace" make -C /systemd-test-module -f /usr/share/selinux/devel/Makefile clean load systemd_test.pp QUIET=n; then
         dfatal "Failed to build the systemd test module"
         exit 1
     fi

test/testsuite-06.units/load-systemd-test-module.service

@@ -1,15 +0,0 @@
-# SPDX-License-Identifier: LGPL-2.1-or-later
-[Unit]
-Description=Load systemd-test module
-DefaultDependencies=no
-Requires=local-fs.target
-Conflicts=shutdown.target
-After=local-fs.target
-Before=sysinit.target shutdown.target autorelabel.service
-ConditionSecurity=selinux
-
-[Service]
-ExecStart=sh -x -c 'echo 0 >/sys/fs/selinux/enforce && make -C /systemd-test-module -f /usr/share/selinux/devel/Makefile load'
-Type=oneshot
-TimeoutSec=0
-RemainAfterExit=yes

test/units/testsuite-06.service

@@ -2,9 +2,6 @@
 [Unit]
 Description=TEST-06-SELINUX
 
-Requires=load-systemd-test-module.service
-After=load-systemd-test-module.service
-
 [Service]
 ExecStartPre=rm -f /failed /testok
 ExecStart=/usr/lib/systemd/tests/testdata/units/%N.sh