Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Integrate os-odl-sfc_osm scenario into XCI

    https://gerrit.opnfv.org/gerrit/#/c/63505/

    The os-odl-sfc_osm scenario has been verified in the previous
    patchsets of this commit. This patch needs to be merged after
    adding OS variables to the post-deployment playbook.

    https://gerrit.opnfv.org/gerrit/#/c/63135/

    installer-type:osa
    deploy-scenario:os-odl-sfc_osm

    Change-Id: I14e83357c9e1db6e31890b5f126b9e405e124594
    Signed-off-by: Venkata Harshavardhan Reddy Allu <venkataharshavardhan_ven@srmuniv.edu.in>