qemu: hotplug: Simplify removal of managed PR infrastructure on unplug
Extract the (possible) removal of the PR backend and daemon into a separate helper which enters monitor on its own. This simplifies the code and allows reuse of this function in the future e.g. for blockjobs where removing a image with PR may result into PR not being necessary. Since the PR is not used often the overhead of entering monitor again should be negligible. Signed-off-by: NPeter Krempa <pkrempa@redhat.com> Reviewed-by: NJán Tomko <jtomko@redhat.com>
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