[os] Added systemd entries to debian filter-syslog

NEWS

 UNRELEASED (2015-06-??)
 
+    [os] Start filtering systemd-related messages from syslog (akkornel)
+
     [rpm] re-enable the rhn plugin for bonafide RHEL hosts, since with
     the new licensing, updates will come from RHN classic (jlent)
 

files/os/etc/filter-syslog/debian

@@ -60,3 +60,19 @@ ipmievd: /^Waiting for events...$/
 
 # Ignore buggy CPU core power limit notifications from new Dell hardware.
 kernel:  /^\[[\d. ]+\] CPU\d+: (Core|Package) power limit /
+
+# Ignore normal systemd messages
+systemd: /^(?:Starting|Stopping) user-\d+\.slice\.$/
+systemd: /^(?:Starting|Started) Session \d+ of user \w+\.$/
+systemd: /^(?:Created|Removed) slice user-\d+\.slice\.$/
+systemd: /^(?:Starting|Stopping) User Manager for UID \d+\.\.\.$/
+systemd: /^(?:Started|Stopped) User Manager for UID \d+\.$/
+systemd: /^(?:Starting|Stopping|Stopped) (?:target)? (?:Paths|Timers|Sockets|Basic System|Default|Shutdown)\.$/
+systemd: /^Reached target (?:Paths|Timers|Sockets|Basic System|Default|Shutdown)\.$/
+systemd: /^Startup finished in \d+ms\.$/
+systemd-logind: /^New session [0-9a-f]+ of user \w+.$/
+systemd: /^Starting Cleanup of Temporary Directories\.\.\.$/
+systemd: /^Started Cleanup of Temporary Directories\.$/
+systemd: /^Received SIGRTMIN\+24 from PID \d+ \(kill\)\.$/
+systemd: /^Starting Exit the Session\.\.\.$/
+systemd-logind: /^Removed session [0-9a-f]+\.$/