1) Add CliRunnable interface as another SPI extension point, this is for verbs for the plugin group on the Main druid cli.
1) Add CliRunnable interface as another SPI extension point, this is for verbs for the plugin group on the Main druid cli.

himanshug/druid-api,gianm/druid-api,drcrallen/druid-api,jon-wei/druid-api,druid-io/druid-api,metamx/druid-api