Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "Create directory to move xci scripts from releng/jjb/xci"
  - Create directory to move xci scripts from releng/jjb/xci

    This change proposes creation of a folder named ci in releng-xci
    in order to move the XCI scripts from Releng. The reason to name
    the directory ci is that this directory has been in use by the
    majority of OPNFV Projects and Releng either executes the scripts
    directly or with the help of wrapper scripts that do not contain
    project specific logic.

    Scripts developed in releng/jjb/xci has too much XCI specific stuff
    in them, making it difficult to keep the separation between
    XCI framework and CI itself. Apart from that, having scripts
    in Releng makes it troublesome to verify them properly.

    Another importance of moving the scripts here is to ensure
    these scripts can be used by other CI/automation tooling such
    as Zuul in future. It is better to move the scripts now before
    things get even more complicated to move.

    Change-Id: Id22c2c2e09950b49a36a04a78208a3404de9c088
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>