Revert "HEAD-1988: refactor registrar into a library, and use new zkplus featuring node-zookeeper-client (including lib directory)"
Revert "HEAD-1988: refactor registrar into a library, and use new zkplus featuring node-zookeeper-client (including lib directory)"

This reverts commit 7cb3fdf45765d7f9df635d1359a400bf9edc5f77.

joyent/registrar,joyent/registrar