The version attribute is missing from the R

[dongahn]

What's emitted

2019-06-28T17:57:30.207491Z qmanager.info[0]: jobid (576431587328): {"execution":{"R_lite":[{"rank":0,"node":"59fa0c6cd2b8","children":{"core":"3"}}]}}

This led to the new execution system's reader error.

{"timestamp":1561744650.2166536,"name":"exception","context":{"note":"reading R: Object item not found: version"}}

[dongahn]

It was easy to fix. But then, I get

{"timestamp":1561745825.5159779,"name":"exception","context":{"note":"reading R: R_lite: failed to read target rank list"}}

{"version": 1,"execution":{"R_lite":[{"rank":-1,"node":"node0","children":{"core":"35"}}]}}

Change the issue title to capture all of these RV1 compat issues.

[dongahn]

Wrong log:

> {"version": 1,"execution":{"R_lite":[{"rank":-1,"node":"node0","children":{"core":"35"}}]}}
< {"version": 1,"execution":{"R_lite":[{"rank":0,"node":"59fa0c6cd2b8","children":{"core":"3"}}]}}

So it turned out, rank info was correctly there with hwloc reader. But the rv1 writer emits the rank as an integer not as a string. After this schema fix:

2019-06-28T19:01:35.899599Z qmanager.info[0]: jobid (212114341888): {"version":1,"execution":{"R_lite":[{"rank":"0","node":"59fa0c6cd2b8","children":{"core":"3"}}]}}

ahn1@59fa0c6cd2b8:/usr/src/scratch$ flux job id --to=kvs 212114341888
job.0000.0031.6300.0000
ahn1@59fa0c6cd2b8:/usr/src/scratch$ flux kvs get -r job.0000.0031.6300.0000.guest.exec.eventlog
{"timestamp":1561748495.907171,"name":"init"}
{"timestamp":1561748495.9112291,"name":"starting"}
{"timestamp":1561748495.9112711,"name":"running","context":{"timer":"3600.000000s"}}
ahn1@59fa0c6cd2b8:/usr/src/scratch$

This was the first working end-to-end run!

[dongahn]

PR #481 resolved this.