mender-artifact fails when renaming the update contained in an artifact.
Description
$ mender-artifact sign qemux86-64-uefi-grub_release_1_1.5.1.mender -k private.key Can not store signed artifact: rename /tmp/mender-artifact924437103 qemux86-64-uefi-grub_release_1_1.5.1.mender: invalid cross-device link
$ mender-artifact -v mender-artifact version 2.3.0
$ mender-artifact sign qemux86-64-uefi-grub_release_1_1.5.1.mender -k private.key
Can not store signed artifact: rename /tmp/mender-artifact924437103 qemux86-64-uefi-grub_release_1_1.5.1.mender: invalid cross-device link
$ mender-artifact -v
mender-artifact version 2.3.0