[mozilla-iot-gateway] suggest to start/enable upon installation
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Suppose the user will be expecting that with the package installation the releated service is enabled/started which however currently does not seem to be the case.
Perhaps worth considering to print a note informing the user that the package installation may take some minutes (at least on this node it took probably some 7 - 10 minutes) or else some less patient contemporaries may feel inclined to stop the installation process