Update git submodules

Update git submodules

* Update docs/submodules/apex from branch 'stable/euphrates'
  - Merge "Adapt zrpcd to work for Carbon/Nitrogen" into stable/euphrates
  - Adapt zrpcd to work for Carbon/Nitrogen

    It updates the quagga tar.gz file which is used to
    install zrpcd/quagga.
    The new rpms are compiled with thrift-version 4

    Zrpcd is installed as a process. Additional changes takwqe place
    adopting the installation and checking of zrpcd process

    Note that an extra patch is needed to update or remove the
    building procedure, which is present within the project
    but not used actually.

    JIRA: APEX-508

    Change-Id: If6da075d2aafdb8c2ecfc599f595a7201490aa23
    Signed-off-by: tomsou <soth@intracom-telecom.com>
    (cherry picked from commit 663db511c540fe94b4396146f76bbc40bd3fd852)