Update git submodules

* Update kuryr-tempest-plugin from branch 'master'
  to 06b6d31ee1dc1c266d582bbe73d596b907f40030
  - Temporarily disable stable jobs
    
    We have multiple CI stability issues going on at the moment.  In order
    to be able to merge master fixes, we need to disable broken stable jobs.
    Once kuryr-tempest-plugin is stabilized we should be able to merge fixes
    to the stable jobs and then we'll be able to revert this patch and make
    them voting again.
    
    Change-Id: I5e8fccec80b1a5593e9e32f8dadf8bc220d0424a