Test ocesql's output

[yutaro-sakamoto]

Testsuite checks program executions results, but not output of ocesql command.
Testsuite should check both.

[GitMensch]

I'd suggest to implement #101 first. ... and I'd do that but I still need a direction before starting.
When doing so I could check to test the output of ocesql all along.

[GitMensch]

output is now tested in the tests for --quiet --> can be closed as fixed