It appears that the local device name is completely bonkers in this case.
sudo nova-rootwrap /etc/nova/rootwrap.conf cryptsetup create --key-file=- 36000eb37601bcf0200 0000000000036c /dev/mapper/36000eb37601bcf02000000000000036c
Is just the wrong command entirely to be useful.
It appears that the local device name is completely bonkers in this case.
sudo nova-rootwrap /etc/nova/ rootwrap. conf cryptsetup create --key-file=- 36000eb37601bcf0200 36000eb37601bcf 020000000000000 36c
0000000000036c /dev/mapper/
Is just the wrong command entirely to be useful.