Add earl jobs export that creates tjm file

[godber]

This earl jobs ts-tmp1 <JOBID> to a file.json that is compatible with tjm.

[busma13]

This seems similar to earl jobs save. We could default to saving in the .teraslice directory like it does and provide the same options if they are applicable.

[busma13]

If we want this command to be able to export multiple jobs, then it would be nice to have the file names come from some default, so the user doesn't have to provide a name for every file. This could simply be the name property from the job config. It could possibly be helpful to include the cluster alias and the date in the file name.

If we only want to support exporting one job file at a time we can simply pass the name we want as an argument to the command.

[busma13]

Current setup:

• job file saves to ~/.teraslice/export/<clusterAlias>/<jobConfig.name>.json by default
• pass --export-dir flag to save to a different directory
• pass --file-name or -f to save under a different name
• if exporting multiple job files file-names are assigned to job_ids based on their order

➜  teraslice git:(earl-tjm-export) ✗ earl jobs export local 382b41df-588e-4df6-ab0d-42f063a629f2 9988d547-aee3-4872-932b-b1a0c688f500 --export-dir ./config/test --file-name test382b.json test9988.json

➜  teraslice git:(earl-tjm-export) ✗ ls ./config/test
test382b.json test9988.json

[busma13]

TBD:

• do we want to support passing all as a job_id? If so we would want to disable the --file-name option in that case.
• status option?