bugfix: Enforcing stdout raw output for confirmation inputs

[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.