Update git submodules

* Update puppet-openstack-integration from branch 'master'
  - Merge "Workaround for installing correct version of ruby bundler"
  - Workaround for installing correct version of ruby bundler
    
    See rubygems/bundler#6870
    
    Bundler 2.x dropped support for Ruby < 2.3 so now we detect ruby
    version and install last known to work version.
    
    This means that newer OS will get newer versions of bundler.
    
    Change-Id: I906ad01187ad5b929b378107de065d32d23c5fc2
    Closes-Bug: #1810401