Suggestion about using $OTHER_OPTS instead of verbose option in startup.sh

[supermomonga]

Is there any good reason to run mackerel-agent command with -v option (verbose option) in startup.sh?

I think mackerel-agent command treats $OTHER_OPTS environment variable so if you want to set default option, you should use ENV command in Dockerfile, so we can overwrite default options as we need.

[supermomonga]

I think verbose problem has solved by this commit, but I think it's not necessary to set and pass opts environment variable because there is the feature to treat $OTHER_OPTS. @stanaka what do you think about this?