Check if we need to remove retries in tryCommand

[qnikst]

We retry each command several times. Such code always look very suspicious and it seems as it hides potential problems. I've tried to follow the reasons for adding that, but it was a part of a big commit:

https://github.com/qnikst/HaskellNet/commit/024f647ba67165cc4dee8ec54edeadd992d8cb25

So currently I'm in doubts: removing it will make code cleaner but it could be possible that some systems depend on it and may fail.