Revert "CP-45981: Update xenopsd from python2 to python3"

[edwintorok]

Reverts #5259

Qemu fails to start, changing python3 back to python2 makes it work (and changing it back to 3 again fails):

Dec  1 16:24:22 lcy2-dt72 qemu-dm-2[6600]: qemu-dm-2: terminating on signal 15 from pid 2015 (<unknown process>)
Dec  1 16:24:38 lcy2-dt72 forkexecd: [ info||0 ||forkexecd] qemu-dm-3[11517]: Arguments: 3 --syslog -chardev socket,id=chrtpm,path=/var/lib/xcp/run/swtpm-root-3/swtpm-sock -tpmdev emulator,id=tpm0,chardev=chrtpm -device tpm-crb,tpmdev=tpm0 -std-vga -videoram 8 -vnc unix:/var/run/xen/vnc-3,lock-key-sync=off -acpi -monitor null -pidfile /var/run/xen/qemu-dm-3.pid -xen-domid 3 -m size=4088 -boot order=cd -usb -device usb-tablet,port=2 -smp 2,maxcpus=2 -chardev file,id=serial0,append=on,path=/tmp/local/scratch/xenrt/guest-console-logs/console.3.log -serial chardev:serial0 -display none -nodefaults -trace enable=xen_platform_log -sandbox on,obsolete=deny,elevateprivileges=allow,spawn=deny,resourcecontrol=deny -S -parallel null -qmp unix:/var/run/xen/qmp-libxl-3,server,nowait -qmp unix:/var/run/xen/qmp-event-3,server,nowait -device xen-platform,addr=3,device-id=0x0002 -drive file=,if=none,id=ide1-cd1,read-only=on -device ide-cd,drive=ide1-cd1,bus=ide.1,unit=1 -device nvme,serial=nvme0,id=nvme0,addr=7 -drive id=disk1,if=none,file=/dev/sm/backend/3b170dc2-46df-9030-dca5-f85ef97d1df3/56349a26-6f24-48c1-b7a4-9c4fe3a9ea6e,media=disk,auto-read-only=off,format=raw -device nvme-ns,drive=disk1,bus=nvme0,nsid=2 -device xen-pvdevice,device-id=0xc000,addr=6 -device e1000,netdev=tapnet0,mac=3a:3c:93:a1:04:bf,addr=4,rombar=0 -netdev tap,id=tapnet0,fd=7
Dec  1 16:24:38 lcy2-dt72 forkexecd: [ info||0 ||forkexecd] qemu-dm-3[11517]: Exec: /usr/lib64/xen/bin/qemu-system-i386 qemu-dm-3 -machine pc-i440fx-2.10,accel=xen,max-ram-below-4g=4026531840,allow-unassigned=true,trad_compat=False -chardev socket,id=chrtpm,path=/var/lib/xcp/run/swtpm-root-3/swtpm-sock -tpmdev emulator,id=tpm0,chardev=chrtpm -device tpm-crb,tpmdev=tpm0 -vnc unix:/var/run/xen/vnc-3,lock-key-sync=off -monitor null -pidfile /var/run/xen/qemu-dm-3.pid -xen-domid 3 -m size=4088 -boot order=cd -usb -device usb-tablet,port=2 -smp 2,maxcpus=2 -chardev file,id=serial0,append=on,path=/tmp/local/scratch/xenrt/guest-console-logs/console.3.log -serial chardev:serial0 -display none -nodefaults -trace enable=xen_platform_log -sandbox on,obsolete=deny,elevateprivileges=allow,spawn=deny,resourcecontrol=deny -S -parallel null -qmp unix:/var/run/xen/qmp-libxl-3,server,nowait -qmp unix:/var/run/xen/qmp-event-3,server,nowait -device xen-platform,addr=3,device-id=0x0002 -drive file=,if=none,id=ide1-cd1,read-only=on -device ide-cd,drive=ide1-cd1,bus=ide.1,unit=1 -device nvme,serial=nvme0,id=nvme0,addr=7 -drive id=disk1,if=none,file=/dev/sm/backend/3b170dc2-46df-9030-dca5-f85ef97d1df3/56349a26-6f24-48c1-b7a4-9c4fe3a9ea6e,media=disk,auto-read-only=off,format=raw -device nvme-ns,drive=disk1,bus=nvme0,nsid=2 -device xen-pvdevice,device-id=0xc000,addr=6 -device e1000,netdev=tapnet0,mac=3a:3c:93:a1:04:bf,addr=4,rombar=0 -netdev tap,id=tapnet0,fd=7 -device VGA,vgamem_mb=8,addr=2,romfile= -vnc-clipboard-socket-fd 4 -chardev stdio,id=ovmf -device isa-debugcon,chardev=ovmf,iobase=0x402 -xen-domid-restrict -chroot /var/xen/qemu/root-3 -runas 65538:993
Dec  1 16:24:38 lcy2-dt72 qemu-dm-3[11529]: Moving to cgroup slice ''
Dec  1 16:24:38 lcy2-dt72 qemu-dm-3[11529]: core dump limit: 67108864
Dec  1 16:24:38 lcy2-dt72 qemu-dm-3[11529]: qemu-dm-3: -netdev tap,id=tapnet0,fd=7: TUNGETIFF ioctl() failed: Inappropriate ioctl for device
Dec  1 16:24:38 lcy2-dt72 qemu-dm-3[11529]: TUNSETOFFLOAD ioctl() failed: Inappropriate ioctl for device
Dec  1 16:24:38 lcy2-dt72 qemu-dm-3[11529]: qemu-dm-3: -vnc unix:/var/run/xen/vnc-3,lock-key-sync=off: Failed to start VNC clipboard: Unable to query remote socket address: Socket operation on non-socket

Lets revert this until we understand why it fails, you cannot start any VMs on master currently.

[psafont]

Needs a signoff