units: schedule tmpwatch on idle class

fixme

@@ -9,8 +9,6 @@ v11:
 
 * emergency.service should start default.target after C-d. synchronize from fedora's initscripts package
 
-* tmpwatch: lower ioprio
-
 * drop empty assignments for parse_env_file
 
 * stability promise must say that #ifdef TARGET_XXX style distro compatibility will go away one day
@@ -107,6 +105,8 @@ later:
 
 * document locale.conf, vconsole.conf and possibly the tempfiles.d and modules-load.d mechanism.
 
+* when /proc/self/mountinfo is not parsable, proceed with next line
+
 External:
 
 * place /etc/inittab with explaining blurb.

units/tmpwatch.service

@@ -16,3 +16,4 @@ Before=poweroff.service reboot.service halt.service killall.service
 Type=oneshot
 ExecStart=/usr/sbin/tmpwatch -umc -x /tmp/.X11-unix -x /tmp/.ICE-unix 10d /tmp
 ExecStart=/usr/sbin/tmpwatch -umc 30d /var/tmp
+IOSchedulingClass=idle