Removing moby check

[huguesBouvier]

As per discussion with moby team, we are removing the check for moby in iotedge because we won't be able to rely on "+azure" in the version forever.

That check however " if moby_runtime_uri != "npipe://./pipe/iotedge_moby_engine"" is still valid, but only for windows.
So the moby check was removed altogether for linux and just the check if moby_runtime_uri != "npipe://./pipe/iotedge_moby_engine" was kept for windows.

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[varunpuranik]

I wonder if we should comment this out for now, instead of removing it.

[arsing]

I'd rather delete it than comment it out. We can retrieve it from history later if we need it.