kiji-schema: SCHEMA-581. HBaseKiji/Table client IDs are not unique

 - Include a global unique counter in client IDs for HBaseKiji and HBaseKijiTable.

issue: https://jira.kiji.org/browse/SCHEMA-581
review: https://review.kiji.org/r/1223
commit: https://github.com/kijiproject/kiji-schema/commit/fd8be133a97f803040e9d19ee74b07175c920c9f