virt-dup v0.9.1 beta

kvm host: SLE15, openSUSE Tumbleweed
kvm guest: SLES, SLE Micro

0.8.1: Fix: nbd: more agressive wait udevadm settle before lsblk

Signed-off-by: Roger Zhou <[email protected]>

0.8.0: Fix: VM name could start with the digital number

incorrect use of re.sub group number with number

Good one: re_org_img.sub(r'\g<2>%s\4'%'15sp2',xml_tag_src_img)

Bad one: re_org_img.sub(r'\2%s\4'%'15sp2',xml_tag_src_img)
Which means `re` group number is changed from `2` to `215` badly....