Parameterize the RPM and DEB Repository Locations for People Behind a Proxy

Typically people behind a proxy use repository managers such as Artifactory to proxy upstream RPM and DEB repositories that are behind a proxy. Today, the cookbook attributes cannot be overriden to support custom RPM & DEB repositories to source fluentd

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In #108, we've introduced a cookbook attribute of node["td_agent"]["skip_repository"] to skip this cookbook to setup repository. It's not idealistic solution, but it'll help you to setup your own repository in some wrapper cookbook. Note that you need to update the cookbook to v3.0.0+ to use the skip repository feature.