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Add the monitoring daemon to the command starting the node daemon, given that
they both have to be started on all nodes.

Note that daemon-util only supports starting one daemon at the time, so the
actual command has to be composed as a sequence of two different daemon-util
invocations.

Also, the monitoring daemon invocation is conditional, depending on whether it
was enabled at configure time.
Signed-off-by: Michele Tartara <mtartara@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>