Cleanup foremen/workers relations
Foremen do not report their own core and memory stats.

Conflicts:
	work_queue/src/work_queue_worker.c
Foreman measures disk with workspace
Merge pull request #186 from btovar/foreman-reporting

Commits from Ben and DeVonte include:
1. Clean up the printing of the master-foreman-worker relationships in work_queue_status.
2. Foreman's local disk information is reported to the catalog/master. (the cores and memory is still reported as the aggregate of its workers).
3. Foreman reports cores and memory as 0 in its ready message to master.
4. Fix bug where the disk space of foreman's sandbox was not being used.