Make check options configurable

[sschuberth]

There should be an easy way, e.g. via an external file, to configure the options / command line arguments passed to the individual checkers.

[SiElHocine]

@sschuberth Do you have any suggestion for the implementation ? I can made the changes, I need this option too.

[sschuberth]

Not really... maybe some YAML file, which is by default looked for at ~/.config/gerrit-check.yaml, and which simply contains key / value pairs for tool name / options?