Use the same output for surveys as for logs.

[jkinkead]

Add a package variable to hold the survey output writer and a setter for it.

Add a helper to generate a survey option using the writer for stdout.

Initialize the survey output to be the same as for the log module.

---

Fixes #883 .

[jkinkead]

One thing I forgot to note: The survey library can't just query log.Writer because it requires a special type that include a file descriptor, and there is no way to get an fd from log.

[codecov-commenter]

Codecov Report

Merging #884 (959bc67) into master (7cc41b5) will decrease coverage by 0.02%. The diff coverage is 0.00%.

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@@            Coverage Diff             @@
##           master     #884      +/-   ##
==========================================
- Coverage   39.11%   39.09%   -0.02%     
==========================================
  Files          53       53              
  Lines        7973     7977       +4     
==========================================
  Hits         3119     3119              
- Misses       4440     4444       +4     
  Partials      414      414              

Flag	Coverage Δ
unittests	39.09% <0.00%> (-0.02%)	:arrow_down:

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Files	Coverage Δ
pkg/prompter/survey.go	3.12% <0.00%> (-0.21%)	:arrow_down:

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[mapkon]

Any chance this can be worked on? We need parity with the current test coverage to merge

@jkinkead