Addresses issues with writing console output for IBM i5 Series (OS400).
The normal QP2TERM shell outputs garbage text when attempting to write
directly to STDOUT, likely because of EBCDIC character-encoding used
on IBM platforms. Writing to the OUTPUT mimics using 'echo' or 'print'
and prints properly in the console.
Fixes#1434
Bug fix: no
Feature addition: yes
BC break: no
Symfony2 test pass: yes, but some tests had to be modified
Now all error messages goes to stdout, we cannot separate error
from normal behaviour, this enables writing to stderr stream,
so scripts ran e.g. from cron, can benefit from this well known concept.
There are 2 much nicer implememntations, but:
1) First requires to break the `@api` tagged interfaces.
2) Second requires rewrite of `execute` command declatarion all commands in bundles.
