Disable DBUS support for zbar as:

- it's not used in a SlapOS system (seems only used for webcam support)
- it breaks the concept of SlapOs containerization
- finally it tries to create a DBUS file in /etc/dbus-1/system.d/ which is NOT
  allowed (rightfully) for a slapsoft user
7 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.Eggs.UnitTest-Master.Python2

00:20:33

passed SlapOS.Eggs.UnitTest-Master.Python3

passed SlapOS.SlapRunner.ResilienceTest-Master

00:21:40

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:23:37

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

05:39:58

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

05:20:00

passed SlapOS.Eggs.UnitTest-Master.Python3

00:21:23