feat: stop disapp.service for maintenance by using 'Conflicts=' statement,...

feat: stop disapp.service for maintenance by using 'Conflicts=' statement, which is much more systemd-like and resolves an issue with write access to the disapp.log when stopping the service

templates/usr/local/lib/systemd/system/disapp_maintenance_begin.service.j2

 [Unit]
 Description=stop DisApp for monthly maintenance at ZIH
 After=remote-fs.target
+Conflicts=disapp.service
 
 [Service]
 Type=simple
 Restart=no
-Environment="PERL5LIB=/usr/local/perl/"
-ExecStart=/usr/bin/perl -I /usr/local/perl/ /usr/local/bin/disapp_rosetta.pl \
-          --config-file /home/access/.disapp/disapp.cfg \
-          --stop
+ExecStart=true
 User={{ vault_disapp_user }}
 Group={{ vault_disapp_group }}