Update API to read log from source.

Makes it possilbe to have different procedures for each parser to read
the log file.

Change-Id: I8366b4f3894ce4c96629f7a857501bebfdbd87d8
Rename PBS to TORQUE.

For consistency.

Change-Id: I8f7708763cb5ad19dbddeb74c4d73b0fa66cb582