Add per plugin logging to make it explicit what is logging, if you
include this package under the name clog (coredns log), you can do the
following:
log := clog.NewWithPlugin{whoami{}} // e.g.
And then just log.Info(...); these will then include the plugin ala:
[INFO] plugin/whoami: stuff
So we only need to init the logger and then just use it.
* pkg/log: ability for debug logs
When the debug plugin is enabled all log.Debug calls will print to
standard; if not there are a noop (almost).
The log package wraps some standard log functions as well, so just
replacing "log" with "plugin/pkg/log" should be enough to use this
package.
* docs
* Add docs
* lint
* Test fallthrough to log pkg as well
* simple package - up test coverage
* add other log levels as well
* update docs
