[dsme] Allow custom modules to be loaded. Contributes to JB#49564.

This dsme.service file modification allows to load custom modules by
enlisting them in the systemd environment file.
Custom modules could be loaded both before default sequence (hardcoded
in startup.so or defined in its config file) and after.

Signed-off-by: Bogdan Migunov <bogdanmigunov@yandex.ru>

rpm/dsme.service

@@ -13,7 +13,7 @@ Type=notify
 Environment=BOOTSTATE=USER
 EnvironmentFile=-/run/systemd/boot-status/bootstate
 EnvironmentFile=-/var/lib/environment/dsme/*.conf
-ExecStart=/usr/sbin/dsme -- -p /usr/lib/dsme/startup.so --systemd
+ExecStart=/usr/sbin/dsme -- $DSME_MODULES_PRE -p /usr/lib/dsme/startup.so $DSME_MODULES_POST --systemd
 Restart=always
 RestartSec=1
 StartLimitInterval=600