qemu: hotplug: Refactor qemuHotplugPrepareDiskAccess to work on virStorageSource
qemu: hotplug: Refactor qemuHotplugPrepareDiskAccess to work on virStorageSource

Rather than passing in a virStorageSource which would override the
originally passed disk->src we can now drop passing in a disk completely
as all functions called inside here require a virStorageSource.

Signed-off-by: Peter Krempa <2cf5c04c61aa466e4a47bfedc747d17279c72ffc@redhat.com>
Reviewed-by: John Ferlan <87558058f6f829e5ec976c8ef960720af4ff9c7d@redhat.com>

jardasgit/libvirt,libvirt/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,olafhering/libvirt,jardasgit/libvirt,olafhering/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,nertpinx/libvirt,jardasgit/libvirt,zippy2/libvirt,fabianfreyer/libvirt,crobinso/libvirt,zippy2/libvirt,eskultety/libvirt,eskultety/libvirt,andreabolognani/libvirt,jfehlig/libvirt,crobinso/libvirt,jfehlig/libvirt,andreabolognani/libvirt,nertpinx/libvirt,andreabolognani/libvirt,jardasgit/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,crobinso/libvirt,libvirt/libvirt,eskultety/libvirt,andreabolognani/libvirt,olafhering/libvirt,eskultety/libvirt,libvirt/libvirt,olafhering/libvirt,jfehlig/libvirt,zippy2/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,jardasgit/libvirt,zippy2/libvirt,crobinso/libvirt,libvirt/libvirt,eskultety/libvirt