[Bug 1763323] Re: ubuntu_fan_smoke_test failed on 4.4/4.15 kvm & azure kernel

Spotted on Cosmic KVM as well.

** Summary changed:

- ubuntu_fan_smoke_test failed on 4.4/4.15 kvm & azure kernel
+ ubuntu_fan_smoke_test failed on 4.4/4.15/4.18 kvm & azure kernel

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https://bugs.launchpad.net/bugs/1763323

Title:
ubuntu_fan_smoke_test failed on 4.4/4.15/4.18 kvm & azure kernel

Status in ubuntu-kernel-tests:
Confirmed
Status in linux package in Ubuntu:
Triaged
Status in linux-kvm package in Ubuntu:
New
Status in linux source package in Xenial:
Triaged
Status in linux-kvm source package in Xenial:
New

Bug description:
The "enable disable fan test" will fail with Xenial KVM kernel

Error message:
RTNETLINK answers: Operation not supported
/usr/sbin/fanctl: ip link add ftun0 type vxlan id 16384000 dev ens4 dstport 0 local 10.246.72.56 fan-map 250.0.0.0/8:10.246.0.0/16
/usr/sbin/fanctl: WARNING: ftun0: failed to configure address translation
RTNETLINK answers: Cannot assign requested address
iptables v1.6.0: Couldn't load target `fan-egress':No such file or directory

Try `iptables -h' or 'iptables --help' for more information.
iptables: Bad rule (does a matching rule exist in that chain?).
iptables: Bad rule (does a matching rule exist in that chain?).
iptables: No chain/target/match by that name.
rm: cannot remove '/run/ubuntu-fan/nat-core': No such file or directory
/usr/sbin/fanatic: unable to bring fan up, unable to configure

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-1021-kvm 4.4.0-1021.26
ProcVersionSignature: User Name 4.4.0-1021.26-kvm 4.4.117
Uname: Linux 4.4.0-1021-kvm x86_64
ApportVersion: 2.20.1-0ubuntu2.16
Architecture: amd64
Date: Thu Apr 12 10:22:57 2018
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: linux-kvm
UpgradeStatus: No upgrade log present (probably fresh install)

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