Info and color codes logged to stdout

[jsha]

Steps to reproduce:

node_exporter --log.format 'logger:syslog?appname=node_exporter&local=7' &
less /var/log/syslog

Expected result: node_exporter log lines don't contain spelled-out severities or ANSI color codes.

Actual result: node_exporter log lines do contain severities and color codes.

Sep  4 22:16:31 btudb node_exporter[15767]: @cee:#033[34mINFO#033[0m[0000] Starting node_exporter (version=0.12.0, branch=master, revision=df8dcd2)  #033[34msource#033[0m=node_exporter.go:135
Sep  4 22:16:31 btudb node_exporter[15767]: @cee:#033[34mINFO#033[0m[0000] Build context (go=go1.6.2, user=root@ff68505a5469, date=20160505-22:14:18)  #033[34msource#033[0m=node_exporter.go:136
Sep  4 22:16:31 btudb node_exporter[15767]: @cee:#033[34mINFO#033[0m[0000] No directory specified, see --collector.textfile.directory  #033[34msource#033[0m=textfile.go:57

[SuperQ]

Yikes, I guess that's coming from the logging library. May be an issue for all use of our common logging0.

[discordianfish]

This issue was moved to prometheus/common#71