Should have done "pad to 8 characters" on the hex conversion, but it was
instead hardcoded to pad a single `0`, which is right in a lot of cases
but not all.
For example:
>>> ip1 = ipaddress.ip_address('98.136.140.23')
>>> ip2 = ipaddress.ip_address('10.1.1.1')
>>> "%X" % ip1._ip
'62888C17'
>>> "%X" % ip2._ip
'A010101'
Change-Id: Ia9fec4e72c00f7086489b245d9dc50ed9c27f12a
d27ee3f0ee