Summary:
Introduces 2 utitilies:
- ##print_obj##: Prints the whole Job in a nice way -- each op call takes one single line and nets are inlined for much better readability. Loops and parallel steps are easy to read.
- ##analyse_obj##: Goes through a Job and checks 2 things:
- that there will be no undefined blob errors at execution.
- no blob of same name will be created by parallel execution steps
Reviewed By: dzhulgakov
Differential Revision: D4142381
fbshipit-source-id: 61bf3398c22e9947493e99145ce2bfc2646830a6
