Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "Check if /etc/ssl/certs exists before creating it"
  - Check if /etc/ssl/certs exists before creating it
    
    In CentOS and Suse, /etc/ssl/certs is a symbolic link to
    /etc/ssl/pki/tls/certs.  The Ansible module "file" will fail if it is asked to
    create a directory which is already a symbolic link.
    
    This patch will check if /etc/ssl/certs exists before trying to create it.
    
    The same check is done both on the host and the opnfv guest VM.
    
    Also, /etc/certs is only writable by root, so we need a "become: true" clause
    to be able to modify it in localhost (but not in opnvf VM).
    
    Change-Id: Iab6c3c162548f84ad6082829e4a7c2ab63d2cfa0
    Signed-off-by: Tapio Tallgren <tapio.tallgren@nokia.com>
    

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