Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Modify the fuel deployment type judgement in fetch-os_creds.sh"
  - Modify the fuel deployment type judgement in fetch-os_creds.sh

    The BUILD_TAG on ZTE baremetal PODs don't include the word "baremetal".[1]
    Line 117 can't be correctly executed. Use a negative checking instead.

    [1] https://build.opnfv.org/ci/job/functest-fuel-zte-pod1-daily-master/206/injectedEnvVars/

    Change-Id: I1a36494768e0172bcf6a016fd8f2524854c9b876
    Signed-off-by: wu.zhihui <wu.zhihui1@zte.com.cn>