bugfix: Missing confirmation input message

[gvicentin]

Using the tsuru-client sometimes we can't see the confirmation input before entering the answer.

How to reproduce:

# normal behaviour
$ tsuru app remove -a gvicentin-static
Are you sure you want to remove app "gvicentin-static"? (y/n) n
Abort.

# bug happens not only here but with some other commands too
$ tsuru service instance remove rpaasv2-be gvicentin-be
n
Are you sure you want to remove the instance "gvicentin-be"? (y/n) Abort.

Since every confirmation input should not use pagination, we can call the RawOutput function to fix this weird behaviour.
Dependency PR: tsuru/tsuru#2693

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.05%. Comparing base (1e295e0) to head (8cee29c).
Report is 2 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #224      +/-   ##
==========================================
+ Coverage   70.89%   71.05%   +0.16%     
==========================================
  Files          55       55              
  Lines        8809     8824      +15     
==========================================
+ Hits         6245     6270      +25     
+ Misses       1675     1663      -12     
- Partials      889      891       +2     

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