Handle pid in run_single_worker.rb properly
Handle pid in run_single_worker.rb properly

In classes that inherit from MiqQueueWorkerBase, they will fetch images
using `MiqQueue.get`.  Part of what is done in that is calling
`MiqWorker.my_worker`.  This basically makes a call to find a worker
with the `pid` value that matches the same pid used by the current
process.

Unfortunately, this is normally set by the `MiqServer` prior to forking
the worker, so this isn't set by `run_single_worker.rb`.

To address this, either add to the `create_options` an attribute for
`:pid` that will create a new worker with the existing pid of the
current process, or if a `:guid` is passed in, update the attributes of
the existing worker to set the pid.  This is already done by the
`MiqServer`, so this is just making the `run_single_worker.rb` handle
setting the pid as well.

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