Automatically add port for backup and restore

[johscheuer]

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What would you like to be added/changed?

The fdbbackup and fdbrestore command are not working correctly if the port is missing in the blob URL we should ensure on FDB side that this works like expected. In the meantime we could add the port based on a heuristic (if sc=0 we use port 80 otherwise we use port 443) if the account is missing the port.

In addition to that we should document this behaviour to make it easier for other user to debug and fix this known issue.