fix(status): correctly display duration of stopped workflows (#701)

[giuseppe-steduto]

Closes #699

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (02dc830) 58.57% compared to head (b53def8) 58.62%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #701      +/-   ##
==========================================
+ Coverage   58.57%   58.62%   +0.05%     
==========================================
  Files          24       24              
  Lines        2390     2393       +3     
==========================================
+ Hits         1400     1403       +3     
  Misses        990      990              

Files	Coverage Δ
reana_client/utils.py	76.47% <100.00%> (+0.60%)	⬆️

[giuseppe-steduto]

Note for the reviewer: I chose status as the scope of the commit because I think that the commands affected by the PR are a nice user-facing scope for changes to the client. For example, this PR fixes status, list, and in general the commands that use the --include-duration flag, I chose status as it is the one most evidently impacted. WDYT?

[mdonadoni]

LGTM! Needs a rebase 😉

[mdonadoni]

Regarding the scope, I think fix(status) can be a good choice. WDYT @tiborsimko ?
To be pedantic, I would change the commit message to display correct duration ..., just to keep the verb as the first word of the message.