TT#35502 Replace Requires= with Wants= for sems.service

Is service B "Requires" service A to be started before B
and B does NOT require B restart on A restart, B should use "Wants=A".

Convert Wants=network-online.target to After=network-online.target
to be identical for all other NGCP services. IMHO sems should be
restarted if networking got restarted (listen new IP's, etc).

Also sort them alphabetically.

Change-Id: I2e239eec2c33a90f150fe2773566f671cbd2483a

debian/ngcp-sems.service

@@ -2,12 +2,12 @@
 Description=NGCP SIP Express Media Server (SEMS)
 After=mariadb.service
 After=redis-master.service
-After=network-online.target
 After=remote-fs.target
-Requires=mariadb.service
-Requires=redis-master.service
+After=network-online.target
+Requires=network-online.target
 Requires=remote-fs.target
-Wants=network-online.target
+Wants=mariadb.service
+Wants=redis-master.service
 
 [Service]
 Type=simple