cmd: Remove all interaction

[Prnyself]

• Remove all interaction in cmd/qsctl
• Refactor cmd run and reset flags after execution

[codecov[bot]]

Codecov Report

Merging #309 into master will decrease coverage by 0.70%. The diff coverage is 16.92%.

@@            Coverage Diff             @@
##           master     #309      +/-   ##
==========================================
- Coverage   48.78%   48.08%   -0.71%     
==========================================
  Files          21       21              
  Lines        1033     1044      +11     
==========================================
- Hits          504      502       -2     
- Misses        525      538      +13     
  Partials        4        4              

Impacted Files	Coverage Δ
cmd/qsctl/cat.go	81.25% <0.00%> (-18.75%)	:arrow_down:
cmd/qsctl/mb.go	3.70% <0.00%> (-0.47%)	:arrow_down:
cmd/qsctl/mv.go	13.33% <8.33%> (+0.28%)	:arrow_up:
cmd/qsctl/presign.go	10.71% <10.00%> (-2.93%)	:arrow_down:
cmd/qsctl/rm.go	8.33% <10.00%> (ø)
cmd/qsctl/stat.go	19.35% <11.11%> (-1.34%)	:arrow_down:
cmd/qsctl/rb.go	11.42% <12.50%> (+0.90%)	:arrow_up:
cmd/qsctl/tee.go	30.43% <16.66%> (-4.57%)	:arrow_down:
cmd/qsctl/ls.go	8.25% <20.00%> (-0.49%)	:arrow_down:
cmd/qsctl/cp.go	32.78% <21.42%> (+0.52%)	:arrow_up:
... and 2 more

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[Prnyself]

Implement in #310