systemd: silence systemd for sysmobts-2050

* use /etc/systemd/system.conf to silence systemd own
  log messages

* bump PRINC to 20

Fixes: SYS#235

recipes-fixes/systemd/systemd/sysmobts-2050/system.conf

@@ -0,0 +1,43 @@
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+#
+# See systemd.conf(5) for details
+
+[Manager]
+#LogLevel=info
+LogTarget=null
+#LogColor=yes
+#LogLocation=no
+#DumpCore=yes
+#CrashShell=no
+ShowStatus=no
+#CrashChVT=1
+#CPUAffinity=1 2
+#DefaultControllers=cpu
+DefaultStandardOutput=syslog
+DefaultStandardError=syslog
+#JoinControllers=cpu,cpuacct,cpuset net_cls,net_prio
+RuntimeWatchdogSec=45
+#ShutdownWatchdogSec=10min
+#CapabilityBoundingSet=
+#TimerSlackNSec=
+#DefaultLimitCPU=
+#DefaultLimitFSIZE=
+#DefaultLimitDATA=
+#DefaultLimitSTACK=
+#DefaultLimitCORE=
+#DefaultLimitRSS=
+#DefaultLimitNOFILE=
+#DefaultLimitAS=
+#DefaultLimitNPROC=
+#DefaultLimitMEMLOCK=
+#DefaultLimitLOCKS=
+#DefaultLimitSIGPENDING=
+#DefaultLimitMSGQUEUE=
+#DefaultLimitNICE=
+#DefaultLimitRTPRIO=
+#DefaultLimitRTTIME=

recipes-fixes/systemd/systemd_sysmocom.inc

@@ -1,7 +1,7 @@
 S_THISDIR := "${@os.path.dirname(bb.data.getVar('FILE', d, True))}"
 FILESPATH =. "${@base_set_filespath(["${S_THISDIR}/${PN}"], d)}:"
 
-PRINC="19"
+PRINC="20"
 
 SRC_URI += "file://journald.conf \
             file://0001-Feature-switch-ListenDatagram-from-run-systemd-journ.patch \
@@ -9,6 +9,7 @@ SRC_URI += "file://journald.conf \
 
 SRC_URI_append_sysmobts-v1 = " file://system.conf"
 SRC_URI_append_sysmobts-v2 = " file://system.conf"
+SRC_URI_append_sysmobts-2050 = " file://system.conf"
 
 # Disable depedency on dbus
 RDEPENDS_${PN}_remove = "dbus"