node_exporter: Send output to syslog.

This is consistent with the way the logs of Prometheus itself are
treated.

srcpkgs/node_exporter/files/node_exporter/log/run

@@ -0,0 +1,2 @@
+#!/bin/sh
+exec vlogger -p daemon.info -t node_exporter

srcpkgs/node_exporter/files/node_exporter/run

@@ -10,4 +10,4 @@
 [ -n "${USE_LOCAL_USER}" ] && : ${USER:=_node_exporter}
 [ -n "${USER}" ] && CHPST_USER="-u ${USER}"
 
-exec chpst $CHPST_USER node_exporter ${RUNIT_COLLECTOR} ${LISTEN_ADDR} ${ARGS}
+exec chpst $CHPST_USER node_exporter ${RUNIT_COLLECTOR} ${LISTEN_ADDR} ${ARGS} 2>&1

srcpkgs/node_exporter/template

@@ -1,7 +1,7 @@
 # Template file for 'node_exporter'
 pkgname=node_exporter
 version=1.1.2
-revision=1
+revision=2
 build_style=go
 go_import_path="github.com/prometheus/node_exporter"
 go_ldflags="-X ${go_import_path}/version.Version=${version}