Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge changes from topic 'fix-vm-on-jenkins'
    
    * changes:
      xci: scripts: start-new-vm.sh: Fix paths for default XCI test
      xci: Replace ANSIBLE_VERBOSITY with XCI_ANSIBLE_VERBOSITY
      xci: scripts: start-new-vm.sh: Print dib output when running on CI
      xci: scripts: start-new-vm.sh: Use 'unsafe' cache for the clean vm disk
      xci: xci-deploy.sh: Make sure all local Ansible installations are gone
      xci: scripts: start-new-vm.sh: Do not allow multiple build-dib-os processes
    
  - xci: scripts: start-new-vm.sh: Fix paths for default XCI test
    
    The XCI test is located in ~/releng-xci inside the new VM so we need
    to look there for an existing one or for executing it after the default
    one has been created and copied to the remote host.
    
    Change-Id: Ieb195293da7832bcb5d29c8a28cc3477205f2e5e
    Signed-off-by: Markos Chandras <mchandras@suse.de>
    
  - xci: Replace ANSIBLE_VERBOSITY with XCI_ANSIBLE_VERBOSITY
    
    The ANSIBLE_VERBOSITY env variable is actually used internally by
    Ansible and exporting it actually makes Ansible super verbose even if
    the variable is empty. This feature is going away in the future so we
    introduce our own XCI_ANSIBLE_VERBOSITY variable which is simply passed
    to the command line to control verbosity in a proper and deterministic
    way.
    
    Change-Id: I8a32eeb1a86b4cb0a9872a51bbe9f9624d096e39
    Signed-off-by: Markos Chandras <mchandras@suse.de>
    
  - xci: scripts: start-new-vm.sh: Print dib output when running on CI
    
    Until we are able to fetch the dib images from external resources, we
    need to build them as part of the job. diskimage-builder can sometimes
    fail so we need to be able to see the log for debug purposes.
    
    Change-Id: Iab8bfba08daa7095cf76537f629c8e7bf6330b17
    Signed-off-by: Markos Chandras <mchandras@suse.de>
    
  - xci: scripts: start-new-vm.sh: Use 'unsafe' cache for the clean vm disk
    
    This is not a production virtual machine and we don't care
    if we lose data in case it's killed unexpectedly so we can just
    ignore the 'flush' commands from the guest. This will also improve
    the overall I/O in the VMs.
    
    Change-Id: Ib486a073f667e22f4a1e65a220ac553874f708cc
    Signed-off-by: Markos Chandras <mchandras@suse.de>
    
  - xci: xci-deploy.sh: Make sure all local Ansible installations are gone
    
    We need to ensure that all Ansible installations are gone before we
    install it again so we can ensure that a local or system wide
    installation will not take precedence over the one we try to install.
    
    Change-Id: I9daf66d661697baf63340ba4af1cd58fbd81f143
    Signed-off-by: Markos Chandras <mchandras@suse.de>
    
  - xci: scripts: start-new-vm.sh: Do not allow multiple build-dib-os processes
    
    apt-get is really unhappy when another instance is running and fails
    with the following error:
    
    E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
    E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
    
    Change-Id: I2fe343fdab8438cb112cce0a4f81c7e3977c55f9
    Signed-off-by: Markos Chandras <mchandras@suse.de>
    

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