Pulseaudio cookie should be deleted on upgrade from trusty to xenial

[Pilot6]

After upgrades from trusty to xenial sound volume is not saved on reboots.

That is probably because file format of the cookie has been changed.

After I deleted the cookie from ~/.config/pulse the volume started to be saved.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: pulseaudio 1:8.0-0ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-24.43-generic 4.4.10
Uname: Linux 4.4.0-24-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: pilot6 2644 F.... pulseaudio
 /dev/snd/controlC0: pilot6 2644 F.... pulseaudio
CurrentDesktop: Unity
Date: Sat Jun 18 21:54:50 2016
InstallationDate: Installed on 2013-10-17 (975 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
SourcePackage: pulseaudio
UpgradeStatus: Upgraded to xenial on 2016-04-29 (50 days ago)
dmi.bios.date: 04/02/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2101
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M5A78L LE
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2101:bd04/02/2015:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM5A78LLE:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer