Pull out 'PxeImage'  declaration if it exists in a provision request
Pull out 'PxeImage'  declaration if it exists in a provision request

Provision requests using PXE provisioning include
the PxeImage class declaration in :pxe_image_id value
when it exists in the provision options hash.

rebuild_automate_request was passing this value via the rest client post
causing the provision to fail.  Stripping out that class value and leaving only the
id allows these requests to go through.

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