Add netdata.service.* to .gitignore (#8556)

.gitignore

@@ -111,6 +111,9 @@ system/netdata-openrc
 system/netdata-init-d
 system/netdata.logrotate
 system/netdata.service
+system/netdata.service.*
+!system/netdata.service.in
+!system/netdata.service.*.in
 system/netdata.plist
 system/netdata-freebsd
 system/edit-config