Get gvir_sandbox_util_guess_image_format search for the last '.'
Get gvir_sandbox_util_guess_image_format search for the last '.'

gvir_sandbox_util_guess_image_format is failing to find the extension
in paths like /tmp/tmp.mg0tQ1JLFl/mine.img

erenyagdiran/libvirt-sandbox,libvirt/libvirt-sandbox,libvirt/libvirt-sandbox,agx/libvirt-sandbox-debian,erenyagdiran/libvirt-sandbox,agx/libvirt-sandbox-debian,agx/libvirt-sandbox-debian,libvirt/libvirt-sandbox,agx/libvirt-sandbox-debian,agx/libvirt-sandbox-debian,erenyagdiran/libvirt-sandbox,erenyagdiran/libvirt-sandbox