qemu-options: Factor out get_opt_name_value() helper
The next commits will put it to use. Signed-off-by: NMarkus Armbruster <armbru@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NKevin Wolf <kwolf@redhat.com> Message-Id: <20200415074927.19897-3-armbru@redhat.com>
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