Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - xci: Rename 'nfvi' to 'installer'

    Using 'installer' to describe the tool that will deploy the foundations
    of a particular XCI scenario is more appropriate than NFVI which
    normally describes both the physical and virtual resources needed by
    an NFV deployment.

    Change-Id: Ib8b1aac58673bf705ce2ff053574fd10cb390d71
    Signed-off-by: Markos Chandras <mchandras@suse.de>
  - xci: nfvi: OSA: Drop SUSE workaround

    The upstream patchset has been merged, so drop the SUSE
    specific workaround when obtaining the status of the galera
    cluster.

Link: https://review.openstack.org/#/c/508154/
    Change-Id: Ic990e6939fb794a532caf8af2759969198fa5d3a
    Signed-off-by: Markos Chandras <mchandras@suse.de>