support config-file

[lazychanger]

trafficstars

#93

[lazychanger]

@estahn i fixed issue #93 , please help me review the code

[itcsoft54]

Please check if ENV is prior to values in configuration file. If not it can break the way that debian package Prometheus export (using /etc/default/<name_exporter>.conf file for parameters) that currently use ENV prior to configuration to redefine value. Conf file seem to be load after env variables loaded, in case of define both in ENV and conf file.

[lazychanger]

Please check if ENV is prior to values in configuration file. If not it can break the way that debian package Prometheus export (using /etc/default/<name_exporter>.conf file for parameters) that currently use ENV prior to configuration to redefine value. Conf file seem to be load after env variables loaded, in case of define both in ENV and conf file.

I think ENV has a higher weight than files. so you can see use mapEnvVars to override the file configuration. My english for Google Transfer. Please don't mind. Thanks for you review.

[stale[bot]]

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