[SRU] jackdbus produces high cpu load

[Impact]

 * Users have reported issues with high CPU load when running jackd and
   jackdbus, causing system slowdowns

 * This newer version was backported into the Ubuntu Studio Backports PPA
   and has shown to have success in fixing this issue.

[Test Case]

 * Attempt to run jackd and jackdbus, jackd tends to take 100% per CPU

 * Killing jackd and jackdbus reduces CPU down to nominal levels

 * Version in Ubuntu Studio Backports PPA does not have this issue, same version exists in Ubuntu Groovy Gorilla.

[Regression Potential]

 * Since jackd is used by multiple professional audio applications and therefore there could be potential negative impact on those applicaitons.

 * Although that regression potential exists, multiple users have reported great success when using the newer version.

[Other Info]

 * Although not a "bug" per se, upstream developer lamented the fact that the version in 20.04 is so far behind.

 * Most audio applications and plugins in Ubuntu 20.04 have been developed with this version of Jackd in mind.

----
Original bug report:

if jackd and jackdbus run, jackd and/or jackdbus produce high cpu load. jackd tends to take all availabl CPU power bringing the system to slow down remarkably. Killing jackd and jackdbus frees cpu and system load drops from 100%/per CPU down to ~4% overall.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: pulseaudio-module-jack 1:13.99.1-1ubuntu3.3
ProcVersionSignature: Ubuntu 5.4.0-37.41-generic 5.4.41
Uname: Linux 5.4.0-37-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.3
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: sct-muc 1800 F.... pulseaudio
 /dev/snd/pcmC0D0c: sct-muc 1800 F...m pulseaudio
 /dev/snd/pcmC0D0p: sct-muc 1800 F...m pulseaudio
 /dev/snd/timer: sct-muc 1800 f.... pulseaudio
CasperMD5CheckResult: skip
Date: Thu Jun 18 18:08:25 2020
InstallationDate: Installed on 2019-09-09 (282 days ago)
InstallationMedia: Xubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
ProcEnviron:
 LANGUAGE=de_DE
 TERM=screen
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
SourcePackage: pulseaudio
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/27/2020
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: 6.00
dmi.board.name: 440BX Desktop Reference Platform
dmi.board.vendor: Intel Corporation
dmi.board.version: None
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 1
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd02/27/2020:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A:
dmi.product.name: VMware Virtual Platform
dmi.product.version: None
dmi.sys.vendor: VMware, Inc.