agl-compositor: Change test to use target image

As the final goal is to use agl-compositor on target images change the
test to use it. Since target images already provide a compositor, change
the configuration to use the agl-compositor instead.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>

test-cases/agl-compositor.yaml

@@ -2,7 +2,7 @@ metadata:
   name: agl-compositor
   format: "Apertis Test Definition 1.0"
   image-types:
-    minimal:  [ armhf, amd64 ]
+    target:  [ armhf, amd64 ]
   image-deployment:
     - APT
   type: functional
@@ -21,8 +21,10 @@ metadata:
 
 run:
   steps:
-    - "Install agl-compositor and maynard packages"
-    - $ sudo apt-get install maynard
-    - "Run agl-compositor:"
-    - $ sudo XDG_RUNTIME_DIR=/tmp agl-compositor --tty=7
+    - "Install agl-compositor package"
+    - $ sudo apt-get install agl-compositor
+    - "Configure user-session-launcher to start agl-compositor"
+    - $ sudo sed -i 's@^Exec=.*@Exec=/usr/bin/agl-compositor@' /etc/xdg/user-session-launcher/session.launcher
+    - "Reboot the machine"
+    - $ sudo reboot
     - "Verify that a desktop shows in screen"