Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - xci: scripts: start-new-vm.sh: Disable nested virtualization in clean VM
    
    When using the clean VM for the tests, we will end up with 3 levels of
    virtualization when functest is executed (1st level = clean vm, 2nd
    level = compute node, 3rd level = functest VMs). This makes the functest
    VM terribly slow leading to all sorts of random failures. It appears
    that KVM can't handle this case, so we need to switch to the QEMU
    interpreter instead which is slower but functional. This only affects
    the Jenkins jobs, so deployments on baremetal will still use 2 levels of
    nested KVM virtualization which should work fine.
    
    Change-Id: If274129fbf347526982ac4cf577d216173eb4d1b
    Signed-off-by: Markos Chandras <mchandras@suse.de>
    
  - xci: scripts: start-new-vm: Set pipefail option
    
    In commit I75a8cb8c05957bb205e63210d6cafaf54d989f32 the 'ts' utility
    was added in order to print timestamps for deployment. However, this
    breaks the exit code since 'pipefail' was not set so every job was
    returning 'success'.
    
    Change-Id: Ia5f47ea96a4a5be9ed0664f5c7100accc30cde51
    Signed-off-by: Markos Chandras <mchandras@suse.de>
    

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