Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "export LANG="C" rather than  export LANG="c""
  - export LANG="C" rather than  export LANG="c"

    opnfv@linux-r4ap:~$ export LANG="C"
    opnfv@linux-r4ap:~$ perl -E exit
    opnfv@linux-r4ap:~$ export LANG="c"
    opnfv@linux-r4ap:~$ perl -E exit
    perl: warning: Setting locale failed.
    perl: warning: Please check that your locale settings:
            LANGUAGE = "en_US.UTF-8",
            LC_ALL = "",
            LANG = "c"
        are supported and installed on your system.
    perl: warning: Falling back to the standard locale ("C").

    paste of deploy failing: https://hastebin.com/fufananewa.sql

    Change-Id: Id1ef2430887251044700e03fc1f294ad18adf90a
    Signed-off-by: agardner <agardner@linuxfoundation.org>