Werk #5648: omd stop/start: Add new option to execute site actions simultaneously

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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