cli: introducing run command

[roksys]

• introducing run command, which wrapps create, upload & start.
  Closes cli: wrapper cmd(create, upload, start) #196

• deleting unused imports.

Signed-off-by: Rokas Maciulaitis rokas.maciulaitis@cern.ch

[tiborsimko]

Works well, I left a few cosmetic comments.

Please amend also docs/userguide so that people know how about this wrapper command.

You can say that if people have fully working example with reana.yaml, they can run the workflow easily via the run wrapper command, which will create a new workflow run, upload analysis inputs, and start the workflow run. You can present a small usage scenario going like:

$ vim reana.yaml
$  reana-client run -n myanalysis
$ export REANA_WORKON=myanalysis
$ # ... after a minute...
$ reana-client status 
$ reana-client download results/plot.png

so that people see the full circle.