New home for configuration files

[bartoszmajsak]

To simplify configuration management both from our perspective and end-users we should move configuration to one place - .ike-prow/.

This change requires following adjustments

• change default location of the plugin to .ike-prow/plugin-name.[yml|yaml]
• similar for plugin hint (convention over configuration as discussed here feat(#41): adds support for inline comment for plugin_hint. #84 (comment))
• add this folder to default exclusions

  ike-prow-plugins/pkg/assets/config/test-keeper.yaml

  Line 131 in 69435eb

  # Our own configurations

[bartoszmajsak]

Apart of the repository which @gastaldi linked, here are the other ones which we should open PR to with the new location of the config:

• fabric8-wit
• https://github.com/fabric8-services/fabric8-auth

Please also review if their settings are not overlapping with our extended defaults. In such case, we can maybe even get rid of the files in the repos (like we can in auth).

[dipak-pawar]

@bartoszmajsak I have gone through fabric8-auth, fabric8-wit. Looks like we can get rid of the file test-keeper.yaml in both the repositories as our extended defaults are covering all expressions which is present in both repositories. I have submitted PR for fabric8-wit, fabric8-auth