kiji-poms: POM-34. Change curator jars to compile scope.

issue: https://jira.kiji.org/browse/POM-34
review: https://review.kiji.org/r/1833
commit: https://github.com/kijiproject/kiji-poms/commit/aa0a7799834547ef9e5d9d963fbbbcb46d34b75a