Fix the following warnings reported by udevadm verify:
multipath/11-dm-mpath.rules:18 Whitespace after comma is expected.
multipath/11-dm-mpath.rules:73 Whitespace after comma is expected.
multipath/11-dm-mpath.rules:73 Whitespace after comma is expected.
multipath/11-dm-mpath.rules:78 Whitespace
OverlayBD is a novel layering block-level image format, which is design
for container, secure container and applicable to virtual machine,
published in USENIX ATC '20
https://www.usenix.org/system/files/atc20-li-huiba.pdf
OverlayBD already has a ContainerD non-core sub-project implementation
in us
