When having a larger number of sites an "omd start" or "omd stop" operation
may take a lot of time since all processes are handles sequentially. To improve
the overall execution time we have now added the optional -p/--parallel arguments
to handle the site actions simultaneously.
This change has mainly been made to fix long running overall startup / stop times
caused when having a lot of sites on a single system. This can be a problem
especially in clustered environments.
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