Werk #4281: Fixed piggyback hosts with spaces in names leading to crashes

It was possible for agent plugins / special agents to create piggyback hosts with spaces in their names which lead to crashes of Check_MK check helpers when trying to check these hosts.

These spaces will now automatically be replaced by underscores to workaround this issue. In case you want to have another replacement logic, you can use the piggyback translation ruleset to override the default behaviour.

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