add tests when converting to separate files

[kadel]

Right now we have tests that only test kompose convert --stdout - https://github.com/skippbox/kompose/blob/36aa6d8c3b4abcfd3779a76309cc084fe2b09ba7/script/test/cmd/tests.sh#L22

We should have also tests that are testing kompose convert as there are some differences how we get output for stdout and files.

this should prevent regression such as #126 happening again

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[surajnarwade]

/remove-lifecycle rotten

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