Enforce MPD setup during installation (MiczFlor#2309)

* fix: removed obsolete file

* fix: removed non optional mpd setup option. 

always install mpd config

* fix: renamed test scripts

* change: change spotify setup default to no

* fix: rename sample mpd.conf

.github/workflows/test_docker_debian_codename_sub.yml

@@ -144,7 +144,7 @@ jobs:
       fail-fast: false
       matrix:
         username: ['pi']
-        test_script: ['run_installation_classic.sh', 'run_installation_tests2.sh', 'run_installation_tests3.sh', 'run_installation_staticip_dhcpcd.sh', 'run_installation_autohotspot_dhcpcd.sh', 'run_installation_autohotspot_NetworkManager.sh']
+        test_script: ['run_installation_classic.sh', 'run_installation_rfid.sh', 'run_installation_spotify.sh', 'run_installation_staticip_dhcpcd.sh', 'run_installation_autohotspot_dhcpcd.sh', 'run_installation_autohotspot_NetworkManager.sh']
         include:
           - username: 'hans'
             test_script: 'run_installation_classic.sh'