* Consistent license message for all the go files
* Fixing the last set of unconsistencies with the license headers
* Addressing PR review comments
* Fixing busy.go and busy_test.go license header
* Stop inserting hashed plugin keys
* Address comments
* Remove else statement
* Address comments
* Add comment
* Update as per comments
* Refactor as per comments
* Update plugin_key_value_store.go
minor comment tweaks
* fail on non StatusNotFound for original key query
* idiomatic error handling, and do not clean up if insert fails