test: Move testsuite-03 units to .units directory

test/units/hello-after-sleep.target

@@ -1,6 +0,0 @@
-# SPDX-License-Identifier: LGPL-2.1-or-later
-[Unit]
-Description=Sleep for a minute, then say hello.
-Wants=sleep.service hello.service
-After=sleep.service
-Before=hello.service

test/units/hello.service

@@ -1,6 +0,0 @@
-# SPDX-License-Identifier: LGPL-2.1-or-later
-[Unit]
-Description=Hello World
-
-[Service]
-ExecStart=/bin/echo "Hello World"

test/units/sleep.service

@@ -1,7 +0,0 @@
-# SPDX-License-Identifier: LGPL-2.1-or-later
-[Unit]
-Description=Sleep for 1 minute
-
-[Service]
-Type=oneshot
-ExecStart=/bin/sleep 60

test/units/unstoppable.service

@@ -1,6 +0,0 @@
-# SPDX-License-Identifier: LGPL-2.1-or-later
-[Service]
-Type=oneshot
-RemainAfterExit=yes
-ExecStart=/bin/echo "I'm unstoppable!"
-ExecStop=/bin/systemctl start --no-block unstoppable.service