added test for #652, stepped on #653 while testing the test, added test for that too

[ldemailly]

• added test for fortio server should error on extra non flag arguments #652, stepped on fortio curl exit status is 0 despite error #653 while testing the test, added test for that too
• fixed fortio curl exit status is 0 despite error #653
• fix fortio server should error on extra non flag arguments #652

[codecov]

Codecov Report

Base: 88.5% // Head: 88.5% // No change to project coverage 👍

Coverage data is based on head (74de56a) compared to base (08dd2ac).
Patch has no changes to coverable lines.

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #654   +/-   ##
======================================
  Coverage    88.5%   88.5%           
======================================
  Files          30      30           
  Lines        4361    4361           
======================================
  Hits         3858    3858           
  Misses        337     337           
  Partials      166     166           

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[asha-oss]

good job!