The goal here is to remove the job hierarchy because it doesn't add much value to the infrastructure.
I have removed most of the job hierarchy related files but there might still be other clean-ups to do after this CL (if some file does an import of ls_job, for example).
Testing: I tested this with the updated client.py and it seemed to work (it printed the correct ssh command after finding the linux machine).
PRESUBMIT=passed
R=bjanakiraman,raymes
DELTA=295 (134 added, 149 deleted, 12 changed)
OCL=45500-p2
RCL=45516-p2
RDATE=2010/11/30 15:09:36
P4 change: 42606689
11 files changed