fix: add more logging

[CarstenLeue]

In a customer scenario the operator can hang. Debugging shows that the createInstanceRunningAction method sometimes never returns. This in turn causes a central lock never to be released, so all subsequent operations hang. The operator has to be restarted.
Why does the createInstanceRunningAction method never return?

This PR add entry/exit logs to the involved functions to be able to tell the reason.
I am suspecting that the operation that is trying to query the leases for the VSI (and the associated IP address) never returns. Maybe this is caused by an incorrect use of the NeedResults parameter in the NetworkGetDhcpLeases call. I was not able to find any documentation of this parameter and I suspected it would set the maximum number of expected results, so I set it to math.MaxInt. Maybe however this is meant to be just a flag modeled as an int32. In this PR I set it to 1 to see if this helps. At the same time I opened a question to the author of the libvirt library: digitalocean/go-libvirt#197

In any case this PR should show what's happening:

• if the code still hangs, we will see what method hangs and then try to figure out why
• if the code does not hang, the NeedResults setting was wrong in the first place and then we have at least detailed logs