Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Fetch admin.conf from master on kubernetes scenario"
  - Fetch admin.conf from master on kubernetes scenario

    Now we have joid deploy kubernetes scenario
    We need admin.conf when run test case
    We can fetch admin.conf by:
        juju scp kubernetes-master/0:config admin.conf
    Also we need a jenkins job to fetch it.

    Change-Id: I13a6a17ca13e247cfc50774bf5104480fc03631a
    Signed-off-by: chenjiankun <chenjiankun1@huawei.com>